This was one of the twistiest thrillers i've read in a while! thanks to @netgalley and @putnambooks for an early copy of this, this was such a fun read! 
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Synopsis: Sam, Margaret, and Diana are off to upstate NY for a girls' weekend, when they lose the keys to their rental car at a rest stop in Catskill. That night, Diana disappears after a drunk night at a bar, and when Sam and Margaret involve the police, they learn that there's no record of Diana existing. They worry that Diana's obsessive ex found her, but Sam and Margaret both have unexpected exes turning up as well, making everyone seem suspicious. 
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Every time I thought I knew where this was going, I was quickly proven wrong. This did such a great job of subtly inserting red herrings and making me question absolutely everyone. I certainly did not expect the major twists, and it never felt like it was trying too hard to force in twists. 
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I also really liked how the pacing picked up as the book neared its climax. It was always unsettling - it was clear from the beginning something was off - but you have no choice but to fly through it as it got into the meat of the mystery. 
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I read a ton of thrillers, so to find one that keeps me so invested is pretty rare, I'd definitely recommend this!