 Unbeknownst to Fabienne her husband, a corrupt businessmen, is in league with the Soviet intelligence and has married her on their instructions.The exchange in Germany goes wrong, however, when during the handover the Soviet spy - laden down with capitalist consumer goods from the West - sinks through the ice and drowns.As the British now have nobody to exchange for her husband, Fabienne sets out to capture an enemy agent on her own initiative.