diff --git a/content/books/books.yaml b/content/books/books.yaml
index 36a5bb7..1b34154 100644
--- a/content/books/books.yaml
+++ b/content/books/books.yaml
@@ -2,4 +2,8 @@ $schema: ../../schemas/blocks/card-group.json
 type: card_group
 card_type: book_card
 id: books
-cards: []
+cards:
+  - {
+      isbn: "9780321623218",
+      cover_url: "https://images-na.ssl-images-amazon.com/images/P/0321623215.01.L.jpg",
+    }