Burned out by both her marriage and work, Liz is desperate for an escape. More than that, she craves an adventure, a total reset. So when she plans a vacation with her three best friends, she persuades them to spend four nights camping in the stunning mountains of Norway. Following a trail that climbs through lush valleys, towering peaks and past jewel-blue lakes, Liz is sure that the hike is just what they need. But as they stride farther from civilization, it becomes clear that the women are not the only ones looking to lose themselves in the mountains. The wilderness hides secrets darker than they ever could have imagined, and if they’re not careful, not all of them will return.

It was supposed to be the perfect weekend away. Six very different women travel to a sun-soaked Greek island for a bachelorette trip to celebrate Lexi’s upcoming wedding. From the glorious ocean views to the quaint tavernas and whitewashed streets, the vacation seems too good to be true. But dangerous undercurrents run beneath the sunset swims and midnight cocktails --- because each of the women is hiding a secret. Someone is determined to make sure that Lexi’s marriage never happens --- and that one of them doesn’t leave the island alive.

Katie’s world is shattered by the news that her headstrong and bohemian younger sister, Mia, has been found dead at the bottom of a cliff in Bali. Although they’d hardly spoken to each other since Mia suddenly left on an around-the-world trip six months earlier, Katie refuses to accept that her sister would have taken her own life. Distraught that they never made peace, Katie leaves her orderly, sheltered life in London behind and embarks on a journey to find out the truth.