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.

A collection of three Diamond Brothers mysteries in which Tim and Nick bungle their way through a search for a missing philanthropist, find themselves in a Parisian prison, and are stranded on a Scottish island with a murderer.