diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6edfa01..c5549a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Cache entry detail page — `GET /cache/entries/:id` shows the full key, byte size, and created-at for a single entry; value body is gated behind `SolidStackWeb.allow_value_preview` (default `false`); when enabled, displays up to 4 KB of the raw serialized value with a truncation notice; entry key in the browser table is now a link to the detail page; **Delete** button on the detail page redirects back to the entry list
 - Solid Cache entry browser — `GET /cache/entries` lists all `SolidCache::Entry` records in a paginated, sortable table (key, byte size, created-at); sortable by any column; key-substring search filters the list; per-row **Delete** removes a single entry; **Flush All** header button deletes every entry with a confirmation prompt; Cache subnav (Overview / Entries) added to the layout
 
 ## [0.4.0] - 2026-05-26
diff --git a/README.md b/README.md
index 60e5a22..317ce8f 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,10 @@ SolidStackWeb.configure do |config|
 
   # Maximum results shown by the search feature (default: 25).
   config.search_results_limit = 25
+
+  # Show the raw serialized value on the cache entry detail page (default: false).
+  # Disable for stores that contain sensitive data.
+  config.allow_value_preview = true
 end
 ```
 
@@ -97,9 +101,10 @@ Filters are preserved when switching between status tabs (Ready / Scheduled / Ru
 ### Features
 
 - **Overview dashboard card** — live entry count and total byte size
-- **Entry browser** — `GET /cache/entries` lists all `SolidCache::Entry` records in a paginated, sortable table; columns: key, byte size, created-at; sortable by any column
-- **Key search** — filter entries by key substring
-- **Delete entry** — per-row delete button removes a single cache entry
+- **Entry browser** — `GET /cache/entries` lists all `SolidCache::Entry` records in a paginated, sortable table; columns: key, byte size, created-at; sortable by any column; key auto-submits search after 4 characters
+- **Key search** — filter entries by key substring; results update automatically after 4 characters
+- **Entry detail page** — `GET /cache/entries/:id` shows the full key, byte size, and created-at; optionally displays the raw serialized value (see `allow_value_preview` below)
+- **Delete entry** — per-row delete button or detail-page button removes a single cache entry
 - **Flush All** — header button deletes every cache entry with a confirmation prompt
 
 ---
diff --git a/ROADMAP.md b/ROADMAP.md
index 25c064a..5a79172 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -12,7 +12,6 @@ The path to v1.0.0 is staged: first achieve feature parity with `solid_queue_das
 
 ### Added
 - **Size distribution stats** — top-N entries by byte size; histogram bucketed by size range
-- **Entry detail** — view the serialised value of a single cache entry (with a configurable `allow_value_preview` toggle for sensitive data)
 - **Cache timeline** — 24-hour chart of entry count and total byte size growth
 - **Stats dashboard card** — expand the overview card to include hit/miss rates if `SolidCache` exposes them, plus oldest-entry age
 
diff --git a/app/assets/stylesheets/solid_stack_web/_09_detail.css b/app/assets/stylesheets/solid_stack_web/_09_detail.css
index dda42a3..f2463b4 100644
--- a/app/assets/stylesheets/solid_stack_web/_09_detail.css
+++ b/app/assets/stylesheets/solid_stack_web/_09_detail.css
@@ -70,6 +70,48 @@
   overflow-y: auto;
 }
 
+.sqw-detail {
+  display: grid;
+  grid-template-columns: auto 1fr;
+  gap: 0.5rem 1.5rem;
+  font-size: 13px;
+  margin-bottom: 1.5rem;
+}
+.sqw-detail__row {
+  display: contents;
+}
+.sqw-detail__row dt { color: var(--muted); white-space: nowrap; align-self: start; padding-top: 0.15rem; }
+.sqw-detail__row dd { word-break: break-all; }
+
+.sqw-value-preview { margin-top: 1rem; }
+
+.sqw-value-preview__header {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-bottom: 0.75rem;
+}
+.sqw-value-preview__header .sqw-section-title { margin-bottom: 0; }
+
+.sqw-value-pre {
+  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
+  font-size: 12px;
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  padding: 0.75rem;
+  overflow-x: auto;
+  white-space: pre-wrap;
+  word-break: break-word;
+  max-height: 500px;
+  overflow-y: auto;
+}
+
+.sqw-value-truncated { font-size: 12px; margin-top: 0.5rem; }
+
+.sqw-link { color: var(--primary); text-decoration: none; }
+.sqw-link:hover { text-decoration: underline; }
+
 .sqw-code-input {
   font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
   font-size: 12px;
diff --git a/app/controllers/solid_stack_web/cache_entries_controller.rb b/app/controllers/solid_stack_web/cache_entries_controller.rb
index f15ecde..ad976ba 100644
--- a/app/controllers/solid_stack_web/cache_entries_controller.rb
+++ b/app/controllers/solid_stack_web/cache_entries_controller.rb
@@ -11,6 +11,10 @@ def index
       @pagy, @entries = pagy(scope)
     end
 
+    def show
+      @entry = ::SolidCache::Entry.find(params[:id])
+    end
+
     def destroy
       ::SolidCache::Entry.find(params[:id]).destroy
       redirect_to cache_entries_path(q: params[:q], column: params[:column], direction: params[:direction]),
diff --git a/app/helpers/solid_stack_web/application_helper.rb b/app/helpers/solid_stack_web/application_helper.rb
index b17288d..73adc1d 100644
--- a/app/helpers/solid_stack_web/application_helper.rb
+++ b/app/helpers/solid_stack_web/application_helper.rb
@@ -1,5 +1,13 @@
 module SolidStackWeb
   module ApplicationHelper
+    def format_cache_value(raw)
+      str = raw.to_s.encode("UTF-8", invalid: :replace, undef: :replace, replace: "?")
+      parsed = JSON.parse(str)
+      { label: "JSON", content: JSON.pretty_generate(parsed) }
+    rescue JSON::ParserError, JSON::GeneratorError
+      { label: "Text", content: str }
+    end
+
     def format_duration(seconds)
       return "—" if seconds.nil?
       return "#{(seconds * 1000).round}ms" if seconds < 1
diff --git a/app/views/solid_stack_web/cache_entries/index.html.erb b/app/views/solid_stack_web/cache_entries/index.html.erb
index cac1967..25998e9 100644
--- a/app/views/solid_stack_web/cache_entries/index.html.erb
+++ b/app/views/solid_stack_web/cache_entries/index.html.erb
@@ -42,7 +42,9 @@
     <tbody>
       <% @entries.each do |entry| %>
         <tr id="cache_entry_<%= entry.id %>">
-          <td class="sqw-monospace sqw-truncate" title="<%= entry.key %>"><%= entry.key %></td>
+          <td class="sqw-monospace sqw-truncate" title="<%= entry.key %>">
+            <%= link_to entry.key, cache_entry_path(entry), class: "sqw-link" %>
+          </td>
           <td><%= number_to_human_size(entry.byte_size) %></td>
           <td class="sqw-muted"><%= entry.created_at.strftime("%b %d %H:%M") %></td>
           <td class="sqw-actions">
diff --git a/app/views/solid_stack_web/cache_entries/show.html.erb b/app/views/solid_stack_web/cache_entries/show.html.erb
new file mode 100644
index 0000000..c87e9f7
--- /dev/null
+++ b/app/views/solid_stack_web/cache_entries/show.html.erb
@@ -0,0 +1,48 @@
+<div class="sqw-page-header sqw-page-header--split">
+  <h1 class="sqw-page-title sqw-truncate" title="<%= @entry.key %>"><%= @entry.key %></h1>
+  <div class="sqw-header-actions">
+    <%= button_to "Delete",
+          cache_entry_path(@entry),
+          method: :delete,
+          class: "sqw-btn sqw-btn--danger sqw-btn--sm",
+          data: { turbo_confirm: "Delete this cache entry?" } %>
+    <%= link_to "← Entries", cache_entries_path, class: "sqw-btn sqw-btn--muted sqw-btn--sm" %>
+  </div>
+</div>
+
+<dl class="sqw-detail">
+  <div class="sqw-detail__row">
+    <dt>Key</dt>
+    <dd class="sqw-monospace"><%= @entry.key %></dd>
+  </div>
+  <div class="sqw-detail__row">
+    <dt>Size</dt>
+    <dd><%= number_to_human_size(@entry.byte_size) %></dd>
+  </div>
+  <div class="sqw-detail__row">
+    <dt>Created</dt>
+    <dd class="sqw-muted"><%= @entry.created_at.strftime("%b %d, %Y %H:%M:%S %Z") %></dd>
+  </div>
+</dl>
+
+<section class="sqw-value-preview">
+  <div class="sqw-value-preview__header">
+    <h2 class="sqw-section-title">Value</h2>
+    <% if SolidStackWeb.allow_value_preview %>
+      <% formatted = format_cache_value(@entry.value) %>
+      <span class="sqw-badge sqw-badge--queue"><%= formatted[:label] %></span>
+    <% end %>
+  </div>
+  <% if SolidStackWeb.allow_value_preview %>
+    <% content = formatted[:content] %>
+    <% truncated = content.length > 4096 %>
+    <pre class="sqw-value-pre"><%= truncated ? content[0, 4096] : content %></pre>
+    <% if truncated %>
+      <p class="sqw-muted sqw-value-truncated">Showing first 4 KB of <%= number_to_human_size(@entry.byte_size) %> total.</p>
+    <% end %>
+  <% else %>
+    <div class="sqw-empty">
+      <p>Value preview is disabled. Set <code>config.allow_value_preview = true</code> in your initializer to enable.</p>
+    </div>
+  <% end %>
+</section>
\ No newline at end of file
diff --git a/config/routes.rb b/config/routes.rb
index a2408c8..6106fc5 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -35,7 +35,7 @@
   get "stats",   to: "stats#index",   as: :stats
   get "history", to: "history#index", as: :history
   get "cache", to: "cache#index", as: :cache
-  resources :cache_entries, only: [:index, :destroy], path: "cache/entries"
+  resources :cache_entries, only: [:index, :show, :destroy], path: "cache/entries"
   resource  :cache_flush,   only: [:destroy],         path: "cache/flush",    controller: "cache/flushes"
   get "cable", to: "cable#index", as: :cable
 end
diff --git a/lib/solid_stack_web.rb b/lib/solid_stack_web.rb
index d233924..e8980d6 100644
--- a/lib/solid_stack_web.rb
+++ b/lib/solid_stack_web.rb
@@ -7,7 +7,7 @@ class << self
                 :alert_webhook_url, :alert_webhook_cooldown,
                 :alert_failure_threshold, :alert_queue_thresholds,
                 :dashboard_refresh_interval, :default_refresh_interval,
-                :search_results_limit
+                :search_results_limit, :allow_value_preview
 
     def page_size
       @page_size || 25
@@ -49,6 +49,10 @@ def search_results_limit
       @search_results_limit || 25
     end
 
+    def allow_value_preview
+      @allow_value_preview || false
+    end
+
     def configure
       yield self
     end
diff --git a/spec/dummy/config/initializers/solid_stack_web.rb b/spec/dummy/config/initializers/solid_stack_web.rb
new file mode 100644
index 0000000..f69ba95
--- /dev/null
+++ b/spec/dummy/config/initializers/solid_stack_web.rb
@@ -0,0 +1,3 @@
+SolidStackWeb.configure do |config|
+  config.allow_value_preview = true
+end
diff --git a/spec/requests/solid_stack_web/cache_entries_spec.rb b/spec/requests/solid_stack_web/cache_entries_spec.rb
index 8087a24..f475e32 100644
--- a/spec/requests/solid_stack_web/cache_entries_spec.rb
+++ b/spec/requests/solid_stack_web/cache_entries_spec.rb
@@ -51,6 +51,31 @@ def create_entry(key: "mykey", value: "myval")
     end
   end
 
+  describe "GET /cache/entries/:id" do
+    it "returns 200 and shows key metadata" do
+      entry = create_entry(key: "detail:key", value: "hello")
+      get "#{engine_root}/cache/entries/#{entry.id}"
+      expect(response).to have_http_status(:ok)
+      expect(response.body).to include("detail:key")
+      expect(response.body).to include("Bytes") # number_to_human_size
+    end
+
+    it "hides value when allow_value_preview is false" do
+      entry = create_entry(key: "secret:key", value: "sensitive")
+      allow(SolidStackWeb).to receive(:allow_value_preview).and_return(false)
+      get "#{engine_root}/cache/entries/#{entry.id}"
+      expect(response.body).to include("allow_value_preview")
+      expect(response.body).not_to include("sensitive")
+    end
+
+    it "shows value when allow_value_preview is true" do
+      entry = create_entry(key: "visible:key", value: "my_cached_value")
+      allow(SolidStackWeb).to receive(:allow_value_preview).and_return(true)
+      get "#{engine_root}/cache/entries/#{entry.id}"
+      expect(response.body).to include("my_cached_value")
+    end
+  end
+
   describe "DELETE /cache/entries/:id" do
     it "deletes the entry and redirects" do
       entry = create_entry