What is the name of the children's book about mice/rats who are solving a mystery?

There is a children's book out there somewhere that is about mice or rats who are detectives or spies or something. I remember that this is a very cool book partly because it includes a clear red plastic decoder to use to solve the puzzles in the book. I remember that the decoder is shaped like a magnifying glass. Any ideas about the name of the book I'm thinking of?

What is the name of the children's book about mice/rats who are solving a mystery?
"Dot %26amp; Jabber and the Great Acorn Myster" by Ellen Stoll Walsh?


http://search.barnesandnoble.com/Dot-Jab...


"Count) mice characters here deliver a somewhat disjointed nature lesson. Spying a young oak tree, "detectives" Dot and Jabber set out to find the larger oak that produced the acorn that sprouted into the smaller tree. After a mole points them in the right direction, the duo wonders how the acorn traveled from the bigger tree to the locatio
Reply:Geronimo Stilton is probably it


It is about mice solving mysteries





I think im not sure but im really sure
Reply:Could it be The Rats of NIMH? It was made into a movie called The Secret of NIMH.

camellia