Knuffle Bunny Free: An Unexpected Diversion is a children's picture book written and illustrated by Mo Willems. It is the third and final book in Willems' Knuffle Bunny series, which also includes Knuffle Bunny: A Cautionary Tale and Knuffle Bunny Too: A Case of Mistaken Identity. The book was released on September 28, 2010, by Balzer + Bray, an imprint of HarperCollins. Source: Wikipedia (en)