"This book is a suspense lover's dream, keeping me up way too late turning pages. With crazy twists and turns, it is a novel that will make you ditch your Friday night plans for more chapters." - Reese Witherspoon

In this eerie psychological thriller set in alluring locales, a backpacking trip takes a deadly turn. With Hitchcockian tension and a dynamic pair of female leads reminiscent of Thelma and Louise, it is a captivating read. This book has been chosen as a Marie Claire Book Club Pick and recognized as one of the Best Books of the Year by NPR and Marie Claire.

Emily and her best friend, Kristen, are having an incredible time in the mountains of Chile during their annual reunion trip. They feel closer than ever. However, on the final night of their trip, Emily discovers a gruesome scene in their hotel suite: blood and broken glass. Kristen claims that she killed a backpacker in self-defense after he attacked her. Even more shocking, this incident bears a disturbing resemblance to a similar tragedy during their previous trip. Can lightning really strike twice?

Back in Wisconsin, Emily tries to bury her trauma by immersing herself in a new relationship and throwing herself into work. However, her peaceful life is disrupted when Kristen unexpectedly pays her a visit. As Emily is forced to confront their violent past, she begins to question Kristen's motives. The more Kristen tries to keep Emily close, the more doubts arise. With the walls closing in and their secrets at stake, Emily must face the truth about her closest friend. Will she be able to escape the grip of their shared secrets, or will they ultimately destroy her relationship, freedom, and even her life?