When Digby O'Day and Percy vacation at a seaside resort, they get involved in a diamond heist and must track down the culprits in time to solve the mystery.

Digby O'Day and Percy are best friends. This daring canine duo can find adventure anywhere-- even entering an All-Day Race! Digby is sure he can win, especially with Percy as his co-driver. But when the race starts and Digby and Percy are quickly left in the dust, it seems like they don't stand a chance. They meet peril after peril: a car that breaks down (and slides back to the edge of a cliff!), a near miss with an oncoming train, and worst of all,...