I love thrillers and my favorite type would definitely be psychological thrillers. Anything dark and twisty with a big twist and I am sold! I had heard about this book everywhere and let me tell you, this definitely lived up to the hype! There were just so many unexpected twists and turns in this intriguing psychological thriller. The authors do an amazing job portraying creepy and realistic obsession while consistently building suspense. The characters were so unpredictable I couldn't put it down without knowing what happened next. I can't wait to read more by these authors since there is some true talent here. Thank you to NetGalley and St. Martin’s Press for the advanced copy of this novel. 4.5 stars.