Sienna’s world shatters when she discovers her husband Cameron’s betrayal. While he’s away on a business trip with his younger colleague, Lucy, Sienna finds a hotel reservation for a room with one bed—confirming her worst fears. Despite the hurt, a desperate phone call from Cameron, stranded in a snowstorm with Lucy, leads Sienna to rush to his side.

On the way, her son, Benjamin, reveals he sabotaged Cameron’s car in an attempt to stop the family from falling apart. After rescuing them, Sienna confronts Cameron about his lies and omissions, and they face the unraveling of their marriage.