Tessa Connover (Katherine Heigl) is barely coping with the end of her marriage when her ex-husband, David (Geoff Stults), becomes happily engaged to Julia Banks (Rosario Dawson)—not only bringing Julia into the home they once shared but also into the life of their daughter, Lily. Trying to settle into her new life, Julia believes she has finally met the man of her dreams, the man who can help her put her own troubled past behind her. But Tessa’s jealousy soon takes a pathological turn until she will stop at nothing to turn Julia’s dream into her ultimate nightmare.
The main cast also includes film and television star Cheryl Ladd as Tessa’s mother, Helen; Sarah Burns (HBO’s Big Little Lies) as Sarah; Whitney Cummings (The Wedding Ringer) as Julia’s best friend, Ali; Simon Kassianides (TV’s Agents of S.H.I.E.L.D.) as Michael Vargas; young actress Isabella Kai Rice (True Blood) as Lily, and Robert Ray Wisdom (HBO’s Ballers) as Detective Pope.