Martha wishes she could help solve crimes like Rascal the police dog, and she's in luck! Officer O'Reilly lets Martha fill in while Rascal is away. Out patrolling, Martha smells a rat. Can she convince them that there's something rotten in the rutabaga? Helen wishes she could be a kid detective just like her favorite book character, Curious Crystal. When Helen and Martha find a business card for "The Whistler" with "You've been warned" written on the back, they think their career as super sleuths has begun.