diff --git a/content/books/books.yaml b/content/books/books.yaml
index 8152f92..6e8dda1 100644
--- a/content/books/books.yaml
+++ b/content/books/books.yaml
@@ -3,6 +3,7 @@ type: card_group
 card_type: book_card
 id: books
 cards:
+  - { isbn: "9781593278885" }
   - { isbn: "9780321992789" }
   - { isbn: "9780321714114" }
   - { isbn: "9781491903995" }