Celeste has spent six years being the perfect wife—accommodating, understanding, always putting Adrian's needs first. So when his ex-girlfriend Madison arrives needing a place to stay, Celeste does what's expected and gives up her own bedroom without protest. But as Madison settles into her home, her marriage, and even her daily routines, Celeste begins to notice the cracks in the carefully constructed life she's built. The more she's pushed aside, the more she starts to question everything she thought she knew about her husband, his past, and the woman now sleeping in her bed. Sometimes the most dangerous person isn't the one who storms into your life—it's the one you've been living with all along.