Until the Day I Die by Emily Carpenter

Grieving the loss of her husband Perry, Erin throws herself into work at the company she, Perry, and a couple of college friends started. After suffering memory blackouts, the worst being when she stole a friend's car and showed up drunk at her daughter's college party, she is urged to check herself into an island spa resort. But the resort is a front for something far more sinister and Erin is soon running for her life in the creepy jungle.
This is a thriller with a lot of twists and turns. The jungle island setting was creepy but beautiful. I like the alternating perspectives of Erin and her daughter, Shorie and how they worked to find the traitor. It was not who I was expecting!!