Paul Duveen gives a lift in his ultra-fast new BMW to an elderly hitch-hiker on his way to Epsom for the Derby. Duveen, cajoled into taking the car to its limit, is promptly booked for speeding. In the course of the remaining journey, the passenger reveals his astonishing skills as a professional pickpocket - his name for himself is a fingersmith - and before they finally part, the fingersmith has a little present for Duveen...