Seventeen-year-old Megan Kessler

has always shared an unbreakable bond with her sister, Melinda—after all, they are identical twins—but when Melinda is abducted, Megan painfully realizes just how deeply set that bond truly is.

Four months after being viciously attacked, Megan is hopeful that her summer visitation with her father, deep in the rugged mountains of Montana, will heal all wounds from that dreadful night.

Unfortunately, her hoped-for summer haven turns into her worst nightmare. From the moment Megan receives the first menacing phone call, threatening her and her twin sister, Megan's expectant quiet life begins to radically spiral out-of-control, forcing her down a dark, twisted path of loss and deception.

Now, with time quickly ticking away for Melinda, Megan's only hope is to turn to Dakota Evans, one of her father's younger, more mysterious employees, and the only person who has witnessed the intensity of the twins' bond.

As Megan and Dakota come closer to discovering the mastermind behind this deadly obsession, the slimmer her chances are of making it out alive.