It's been a while since I've made so much time to read so I could finish a compelling book. I enjoyed its intriguing premise and the evolution of the character Rachel. It's pretty fast-paced, and while it doesn't have quite the twists of "Gone Girl," it would appeal to readers who liked that. 
 One question that remained: (view spoiler)[Who told the news about Megan's first child? I thought only the therapist knew about that, and I don't understand why he would tell. Did I miss something? (hide spoiler)]