Three chapter books about Martha the talking dog in one full-color, fully illustrated paperback! Features Martha on the Case, in which Martha sniffs out the evidence needed to clear her name in a cake-stealing case and catches some would-be jewelry thieves with help from her canine friends; Detective Dog, in which Martha thwarts the smuggling of dangerously infested rutabagas into Wagstaff City and helps Helen sniff out the thief's identity after a rash of robberies; and Secret Agent Dog, in which Martha—a.k.a. agent K9-002—is on a top-secret mission to expose the criminals who try to steal Granny Flo’s soup formula. Includes games, activities, and glossaries of all the new vocabulary introduced in the stories.