Alex Pruitt, an 8-year-old boy living in Chicago, must fend off four international criminals who are seeking a top-secret microchip in his toy car.

Ping is a chihuahua rescued from the pound by nearsighted Ethel, who thinks he’s a cat. When a pair of bumbling thieves try to break into Ethel’s house to steal the money they think she has stashed away, only Ping can foil their plans.