Frost investigates a robbery at a local casino and a hit and run accident that may involve Roger Massie, the son of a local Member of Parliament. Massie has previously been charged, but never convicted of reckless driving. Supt. Mullett is concerned that Frost is on a witch hunt but Frost soon realizes there is a connection between Massie and the casino, in the form of Massie's girlfriend, Julia King. Frost also receives a complaint about PC Shelby, who is accused of stealing jewelry but when Shelby turns up dead Frost must solve yet another complex puzzle.