Mr. Whiskers is a street-wise stray dog with a nose for trouble and a fondness for two girls he calls the Shenanigan Sisters. So when Misty and Zelda's professor father is kidnapped, Mr. Whiskers follows that car, picking up vital clues.

Then the two intrepid girls and one great dog follow the trail through the streets of San Francisco, discovering hidden passageways, buried secrets, and even pirate treasure.

But will they be able to rescue Dad? You bet your best biscuit, they will!

Wendelin Van Draanen's new mystery is the ulti-mutt kid-pleasing caper.