When gambler Toby Swinford dies suddenly of a heart attack he leaves dangerous and unfinished business behind him. It is only a matter of days before Toby’s best friend, the small town solicitor Jeremy Easterbrook gets scent of that business. He is appalled to find a forged passport together with a large amount of foreign currency hidden in Toby’s house. It falls to Toby’s younger brother, who works for the British military government in West Berlin, to reveal a scheme that involves smuggling a young woman and commercially valuable computer data through the Iron Curtain. When the twisted strands of Jeremy’s motivation lead him to take over where Toby had left off, he comes to understand that his involvement requires him to make a binary bet: a bet that can be spectacularly successful or a lethal failure.