Jane and Dagobert Brown are traveling on a lonely road in the Pyrenees on their way to a music festival when they become the targets of a mysterious sniper. Surviving one hazard, they soon encounter another later that night, when their attractive niece involves them in a complicated romantic wrangle with a rather dubious character. Mystery follows mystery, as Russian spies, stolen bicycles, a child prodigy with a weakness for ice cream, and the maestro himself, a renowned harpsichordist with a disconcerting penchant for liquor, create an awfully complicated vacation for the Browns.