Crime is on the rise in Dogtown, and it's all thanks to an art forger! They've swapped one of Puplo Picasso's masterpieces with a fake. Such a big case would normally go to the Top Dog detectives, but they're on vacation... So it's time to call in the Underdog detecvive Agency! What they lack in skill, they make up for in grit and determination. And they are determined to catch the culprit and prove they are the best sleuths in town. Can Fang, Barkley, and the others solve the case before the thief strikes again or the Top dogs return from their trip?