Lisa Macklin is living in Paris with her abusive husband, Robert. After a severe altercation, Robert leaves on a business trip to Algeria, and soon after, Lisa is informed he has died in a plane crash. Struggling to move on, Lisa begins to find solace in the comforting presence of her American friend, Alan Stewart. While attempting to rebuild her life and navigate her grief, Lisa is stunned to discover that Robert is not dead but has faked his death to collect a large insurance payout.

Robert reappears and coerces Lisa into helping him execute his plan, promising that they can start anew with the money. Torn between fear and a lingering sense of marital duty, Lisa agrees, but her secretive behavior arouses Alan's suspicion. As the couple races against time to finalize their scheme, Lisa's emotional turmoil deepens, leading to an intricate web of deception and mistrust. The tension mounts as both their relationship and the plan become increasingly unstable, driving them toward an inevitable climax.