NEW YORK TIMES BESTSELLER • REESE’S BOOK CLUB PICK • “This book is every suspense lover’s dream and it kept me up way too late turning pages. . . . A novel with crazy twists and turns that will have you ditching your Friday night plans for more chapters.”—Reese Witherspoon A backpacking trip has deadly consequences in this “eerie psychological thriller . . . with alluring locales, Hitchcockian tension, and possibly the best pair of female leads since Thelma and Louise” (BookPage), from the bestselling author of The Lost Night and The Herd. A Marie Claire Book Club Pick • Named One of the Best Books of the Year by NPR and Marie Claire