diff --git a/lib/Constants.php b/lib/Constants.php
index 9d531c86..74bedaf3 100644
--- a/lib/Constants.php
+++ b/lib/Constants.php
@@ -27,6 +27,8 @@ const MANUAL_PATH =			WEB_ROOT . '/manual';
 const EBOOKS_DIST_PATH =		WEB_ROOT . '/ebooks/';
 const COVER_ART_UPLOAD_PATH =		'/images/cover-uploads/';
 
+const EBOOKS_IDENTIFIER_PREFIX =	'url:https://standardebooks.org/ebooks/';
+
 const DATABASE_DEFAULT_DATABASE = 	'se';
 const DATABASE_DEFAULT_HOST = 		'localhost';
 
diff --git a/www/ebooks/ebook.php b/www/ebooks/ebook.php
index f69e4e57..6f77f9d5 100644
--- a/www/ebooks/ebook.php
+++ b/www/ebooks/ebook.php
@@ -39,14 +39,8 @@ try{
 		}
 	}
 
-	// Do we have the ebook cached?
-	try{
-		/** @var Ebook $ebook */
-		$ebook = apcu_fetch('ebook-' . $wwwFilesystemPath);
-	}
-	catch(Safe\Exceptions\ApcuException){
-		$ebook = Ebook::FromFilesystem($wwwFilesystemPath);
-	}
+	$identifier = EBOOKS_IDENTIFIER_PREFIX . $urlPath;
+	$ebook = Ebook::GetByIdentifier($identifier);
 
 	// Divide our sources into transcriptions and scans
 	foreach($ebook->Sources as $source){