The Girl Who Was Taken by Charlie Donlea

Two abducted girls—one who returns, one who doesn’t.
 
The night they go missing, high school seniors Nicole Cutty and Megan McDonald are at a beach party in their small town of Emerson Bay, North Carolina. Police launch a massive search, but hope is almost lost—until Megan escapes from a bunker deep in the woods. . . . A year later, the bestselling account of her ordeal has made Megan a celebrity. It’s a triumphant story, except for one inconvenient Nicole is still missing.
 
Nicole’s older sister, Livia, a fellow in forensic pathology, expects that one day soon Nicole’s body will be found and her sister’s fate determined. Instead, the first clue comes from another body—that of a young man connected to Nicole’s past. Livia reaches out to Megan to learn more about that fateful night. Other girls have disappeared, and she’s increasingly sure the cases are connected.
 
Megan knows more than she revealed in her book. Flashes of memory are pointing to something more monstrous than she described. And the deeper she and Livia dig, the more they realize that sometimes true terror lies in finding exactly what you’ve been looking for . . .