Paul, a mild-mannered man on the verge of getting married to his fiancée, Karen, wakes up the morning after his bachelor party with a massive hangover and a beautiful woman named Becky in his bed. Panic-stricken and unable to recall the events of the previous night, Paul tries to cover up his mistake, only to discover that Becky is actually Karen's cousin. As he attempts to navigate this awkward situation, Paul's efforts to keep it a secret lead to a series of comedic mishaps.

Paul's predicament grows increasingly complicated as he tries to fend off Becky's amorous advances while managing his guilt and confusion. Adding to the chaos, Karen becomes suspicious, and Paul's best friend tries to help him handle the escalating crisis. His life becomes a tangled web of misunderstandings, close calls, and humorous scenarios as he struggles to keep his impending wedding on track without his fiancée discovering his misstep. As the tension builds, Paul must decide whether to come clean or continue with his desperate attempts to maintain his façade.