British gangster George Thomason and his hapless aide, Ken Pile (Michael Palin), draft a pair of arrogant Americans, grifter Wanda Gerschwitz and weapons expert Otto West, for a massive diamond heist. When the job goes badly, Wanda attempts to seduce George's stuffy lawyer, Archie Leach, to find out where George hid the diamonds. Meanwhile, Ken repeatedly attempts to kill an elderly woman who witnessed the robbery.
