Scooby-Doo and the Haunted Lab

Scooby-Doo and the Haunted Lab is a children's book by Scholastic.

Premise
A mad scientist ... a spooky laboratory ... and a missing invention with amazing powers. Sounds like a case for Scooby-Doo and his pals from Mystery, Inc.

Characters

 * Scooby-Doo
 * Shaggy Rogers
 * Fred Jones
 * Daphne Blake
 * Velma Dinkley

Notes/Trivia
Comes with a decoder so the reader can decipher the clues.