When thirteen-year-old Nick is framed for a jewel robbery, he and his brother, the bumbling detective Tim Diamond, attempt to clear his name by capturing the master criminal known as the Fence.
After his older brother, a fledgling private detective, agrees to safeguard a package for a dwarf who does not live long, thirteen-year-old Nick scampers to solve the mystery while also trying to stay one step ahead of an assortment of thugs.