Hannah Kennedy gave birth to her daughter Cassidy after a successful in vitro procedure, and her life couldn't get any better. She never planned on losing her wife just two years later and raising Cassidy on her own. When she turns eighteen, Cassidy wants to discover which traits she inherited from the anonymous sperm donor and which came from her mother. To her shock, she learns Hannah is not her biological mother.

When Maggie Walsh shows up wanting a relationship with the daughter she never knew she had, the heat kindled between Hannah and Maggie is not entirely romantic. The love they have for Cassidy will tear all three women apart and bring them together in ways no one could have conceived.