My Reaction in a Nutshell: 
 Gillian Flynn has done it again. 
 The Long Version: 
 I want The Grownup to a full-length novel. Hell, I want The Grownup to be a fucking series of full-length novels. This book was good. As per usual Flynn style, the main character isn't your run of the mill Mary Sue or Goody Two-Shoes. The main character (I honestly can't remember if readers ever hear her called by anything other than "Nerdy" by a coworker) is a former-hand-job-giver-turned-psychic. 
 "I didn't stop giving hand jobs because I wasn't good at it. I stopped giving hand jobs because I was the best at it. 
 But seriously, she got carpal tunnel from her profession. 
 Like her nickname suggests, Nerdy loves to read. However, books aren't always her top priority: 
 "Books may be temporary; dicks are forever." 
 Pretty much this is a book about the MC trying to con a lady into de-ghosting her house. However, things aren't always what they seem. In some creepy twists, Flynn keeps this book fast-paced, eerie, and highly addictive until the very end. 
 ****TRIGGER WARNINGS: prostitution