Andy Bennett (l.) and Katy Halbacka celebrated their debut YA thriller, Codebreaker (Wednesday Books), written under the pen name Jay Martel, with a code-breaking puzzle hunt through the neighborhood around Wild Rumpus Books in Minneapolis, Minn. Codes like those found in the book were posted in the windows of local businesses; participants found these and raced back to the bookstore to deliver the password that granted access to a prize chest of stickers, bookmarks, buttons, and ARCs.
