Kim and John have been happily married for several years, but their relationship is put to the test when John becomes infatuated with a new co-worker named Grant. Kim is shocked to discover that Grant is actually her ex-boyfriend, whom she never told John about.
As John becomes increasingly obsessed with Grant, Kim tries to distance herself from her ex and keep their past a secret. However, John becomes suspicious and accuses Kim of having an affair with Grant.
One day, in a fit of jealousy and rage, John confronts Grant and accidentally kills him. Terrified of the consequences, Kim convinces John to impersonate Grant and cover up the murder. They dispose of the body and create an alibi, but the plan quickly unravels as John becomes more and more invested in the persona of Grant.
As the police investigation heats up, Kim and John's marriage is pushed to the brink. John's obsession with Grant and his attempt to maintain the cover-up take a toll on their relationship, and Kimberly struggles to keep her husband from being caught by the authorities.
Eventually, the truth comes out and both Kim and John are arrested and charged with murder. With their lives and relationship in ruins, they face the consequences of their actions and search for a way to move forward.