Mike Billings decideix provar el joc i s'adona que és bo. La seva fortuna instantània atrau una gran quantitat de personatges, com ara un estafador, un assassí a sou i la dona atractiva necessària.

Mike Billing's newspaper series about quasi-illegal gambling parties in Mayfair have so far been works more of imagination than genuine journalism. But when he and his columnist girlfriend, Jenny Drew, finally manage to infiltrate one of them, it leads quickly to trouble. The party's organiser is found murdered the next morning, and a number of suspects begin to emerge. But which of them killed Lucky Lewis?