Jules Malone has sworn off love after two failed relationships: one with an abusive fiancé whom she calls her white knight-mare, and the other with a nice-but-boring ex with whom she co-parents their son, Max. But then one fateful Christmas Eve, Jules meets Sean, a twinkly-eyed charmer with a captivating smile and an unexpected invitation. Despite Jules's efforts to stay guarded, she finds herself irresistibly drawn to him.

As their relationship deepens, so does Sean's unpredictable behavior. He misses Jules's calls, changes plans abruptly, and hangs up quickly when she enters the room. One night after returning home from a charity meeting, she finds Sean missing and blood everywhere. Panicked, she's about to call 911 when she hears a phone ringing on her patio. It is Sean's. By the time she gets to it, the caller has hung up. Multiple texts follow-as does Jules's journey of shocking discoveries. The first? That she is one of four women sharing full lives with Sean.

But it is the devastating secret these women uncover together that leads to a resolution none of them could ever have imagined...and to the power of sisterhood.