Intelligence operative George Woodhouse is tasked with identifying a mole leaking state secrets, a list that includes his wife, Kathryn. George suspects his wife and uses a psychological game at a dinner party with the other suspects to find the leak, but he is ultimately misled by planted evidence. The real mole is the head of their agency, Arthur Stiglets, who, with Colonel James Stokes, plans to leak a dangerous cyber weapon to incite war. George and his wife work together to expose and stop the plot, with Kathryn ultimately killing Stokes after he attacks.