diff --git a/config/vufind/config.ini b/config/vufind/config.ini
index 41e8fe63810..3d48b0b59e5 100644
--- a/config/vufind/config.ini
+++ b/config/vufind/config.ini
@@ -1114,8 +1114,8 @@ noCoverAvailableImage = images/noCover2.gif
 ; the description tab.
 ;summaries = Syndetics:MySyndeticsId,SyndeticsPlus:MySyndeticsId
 
-; You can select from Syndetics or SyndeticsPlus to load Tables of Contents
-;toc = Syndetics:MySyndeticsId,SyndeticsPlus:MySyndeticsId
+; You can select from Syndetics, SyndeticsPlus or ObalkyKnih to load Tables of Contents
+;toc = Syndetics:MySyndeticsId,SyndeticsPlus:MySyndeticsId,ObalkyKnih
 
 ; You can select from Syndetics or SyndeticsPlus
 ;authorNotes = Syndetics:MySyndeticsId,SyndeticsPlus:MySyndeticsId
diff --git a/module/VuFind/src/VuFind/Content/Loader.php b/module/VuFind/src/VuFind/Content/Loader.php
index b96fa2bfbab..11e58fabe86 100644
--- a/module/VuFind/src/VuFind/Content/Loader.php
+++ b/module/VuFind/src/VuFind/Content/Loader.php
@@ -87,7 +87,7 @@ protected function getIsbnObject($isbn)
      *
      * @param string $isbn ISBN to use for lookup
      *
-     * @return array
+     * @return array|string
      */
     public function loadByIsbn($isbn)
     {
@@ -95,7 +95,6 @@ public function loadByIsbn($isbn)
         if (!($isbnObj = $this->getIsbnObject($isbn))) {
             return $results;
         }
-
         // Fetch from provider
         $providers = explode(',', $this->providers);
         foreach ($providers as $provider) {
diff --git a/module/VuFind/src/VuFind/Content/ObalkyKnihContentFactory.php b/module/VuFind/src/VuFind/Content/ObalkyKnihContentFactory.php
index 141dfb84f35..6d47d71de36 100644
--- a/module/VuFind/src/VuFind/Content/ObalkyKnihContentFactory.php
+++ b/module/VuFind/src/VuFind/Content/ObalkyKnihContentFactory.php
@@ -72,7 +72,6 @@ public function __invoke(
         }
 
         $service = $container->get(\VuFind\Content\ObalkyKnihService::class);
-        $covers = new $requestedName($service);
-        return $covers;
+        return new $requestedName($service);
     }
 }
diff --git a/module/VuFind/src/VuFind/Content/ObalkyKnihService.php b/module/VuFind/src/VuFind/Content/ObalkyKnihService.php
index 754372eb494..2c4ea2b0c78 100644
--- a/module/VuFind/src/VuFind/Content/ObalkyKnihService.php
+++ b/module/VuFind/src/VuFind/Content/ObalkyKnihService.php
@@ -142,7 +142,7 @@ protected function getHttpClient(string $url = null)
      */
     protected function createCacheKey(array $ids)
     {
-        $key = $ids['recordid'];
+        $key = $ids['recordid'] ?? '';
         $key = !empty($key) ? $key
             : (isset($ids['isbn']) ? $ids['isbn']->get13() : null);
         $key = !empty($key) ? $key : sha1(json_encode($ids));
diff --git a/module/VuFind/src/VuFind/Content/TOC/ObalkyKnih.php b/module/VuFind/src/VuFind/Content/TOC/ObalkyKnih.php
new file mode 100644
index 00000000000..9bf41286be3
--- /dev/null
+++ b/module/VuFind/src/VuFind/Content/TOC/ObalkyKnih.php
@@ -0,0 +1,80 @@
+<?php
+
+/**
+ * Obalky knih TOC content loader.
+ *
+ * PHP version 8
+ *
+ * Copyright (C) Moravian Library 2024.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * @category VuFind
+ * @package  Content
+ * @author   Josef Moravec <moravec@mzk.cz>
+ * @license  http://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org/wiki/development Wiki
+ */
+
+declare(strict_types=1);
+
+namespace VuFind\Content\TOC;
+
+use VuFind\Content\ObalkyKnihService;
+
+/**
+ * Class ObalkyKnih
+ *
+ * @category VuFind
+ * @package  Content
+ * @author   Josef Moravec <moravec@mzk.cz>
+ * @license  https://opensource.org/licenses/gpl-2.0.php GNU General Public License
+ * @link     https://vufind.org/wiki/development Wiki
+ */
+class ObalkyKnih extends \VuFind\Content\AbstractBase
+{
+    /**
+     * Constructor
+     *
+     * @param ObalkyKnihService $service Service for getting metadata from obalkyknih.cz
+     */
+    public function __construct(protected ObalkyKnihService $service)
+    {
+    }
+
+    /**
+     * This method is responsible for generating fake TOC data for testing
+     * purposes.
+     *
+     * @param string           $key     API key
+     * @param \VuFindCode\ISBN $isbnObj ISBN object
+     *
+     * @throws \Exception
+     * @return array|string    Returns html string with preview image and link to TOC PDF file
+     */
+    public function loadByIsbn($key, \VuFindCode\ISBN $isbnObj)
+    {
+        $ids = [
+            'isbn' => $isbnObj,
+        ];
+        $data = $this->service->getData($ids);
+        $toc = '';
+        if (isset($data->toc_thumbnail_url)) {
+            $toc = "<p></p><a href='" . htmlspecialchars($data->toc_pdf_url)
+                . "' target='_blank' ><img src='"
+                . htmlspecialchars($data->toc_thumbnail_url) . "'></a></p>";
+        }
+        return $toc;
+    }
+}
diff --git a/module/VuFind/src/VuFind/Content/TOC/PluginManager.php b/module/VuFind/src/VuFind/Content/TOC/PluginManager.php
index c49fb1d8220..4d3d2678a77 100644
--- a/module/VuFind/src/VuFind/Content/TOC/PluginManager.php
+++ b/module/VuFind/src/VuFind/Content/TOC/PluginManager.php
@@ -47,6 +47,7 @@ class PluginManager extends \VuFind\ServiceManager\AbstractPluginManager
      */
     protected $aliases = [
         'demo' => Demo::class,
+        'obalkyknih' => ObalkyKnih::class,
         'syndetics' => Syndetics::class,
         'syndeticsplus' => SyndeticsPlus::class,
     ];
@@ -58,6 +59,7 @@ class PluginManager extends \VuFind\ServiceManager\AbstractPluginManager
      */
     protected $factories = [
         Demo::class => \Laminas\ServiceManager\Factory\InvokableFactory::class,
+        ObalkyKnih::class => \VuFind\Content\ObalkyKnihContentFactory::class,
         Syndetics::class => \VuFind\Content\AbstractSyndeticsFactory::class,
         SyndeticsPlus::class => \VuFind\Content\AbstractSyndeticsFactory::class,
     ];
diff --git a/module/VuFind/src/VuFind/RecordTab/AbstractContent.php b/module/VuFind/src/VuFind/RecordTab/AbstractContent.php
index e026c7d04c7..4312dabbce1 100644
--- a/module/VuFind/src/VuFind/RecordTab/AbstractContent.php
+++ b/module/VuFind/src/VuFind/RecordTab/AbstractContent.php
@@ -96,7 +96,7 @@ public function isActive()
     /**
      * Get content for ISBN.
      *
-     * @return array
+     * @return array|string
      */
     public function getContent()
     {