Y/N Altman is a cardiothoracic surgeon at Grey Sloan Memorial, married to trauma surgeon Owen Hunt, and determined to keep her family and marriage together despite everything they’ve been through. When she meets Cass Beckman, a trauma surgeon from Seattle Presbyterian in an open marriage with her husband David Beckman, Y/N tries to keep things strictly professional. But the connection between her and Cass becomes impossible to ignore, forcing Y/N to navigate loyalty, desire, and the life she thought she was supposed to want.