Katherine Atwell lives a seemingly idyllic life with her wealthy industrialist husband, Wendell. However, beneath the surface, Katherine is unhappy and trapped in a loveless marriage. Seeking solace in an extramarital affair with her husband's business associate, Steve, she is desperate to escape her gilded cage. One night, the situation takes a dark turn when Katherine and Steve hatch a plan to murder Wendell and make his death look like an accident.

As Katherine grapples with the reality of their actions, she becomes increasingly paranoid and guilt-ridden. Her world unravels further when a relentless police detective begins to investigate Wendell's suspicious death. As layers of deceit and treachery are peeled back, Katherine discovers that escaping her entangled life may come at a higher cost than she ever anticipated. The mounting pressure to maintain their facade pushes her to the brink as she navigates through the web of lies and increasing danger surrounding her.