Let's Invest-Tigger-ate! is an original book about the Super Sleuths of My Friends Tigger & Pooh. The book was published by Creative Edge, LLC in 2008, written by Bonnie Brooke and illustrated by Disney Enterprises, Inc., ISBN 1-40378-450-7.
The book presents the characters in a number of scenes and in each is a small mystery for the readers to solve. The answers are not given, allowing readers to think for themselves. At the end of the book, the reader is dubbed an honorary Super Sleuth.