Black Mouth — Ronald Malfi

A group of friends return to their hometown to confront a nightmare they first stumbled on as teenagers in this mesmerising odyssey of terror.

An atmospheric, haunting page-turner from the bestselling author of Come with Me
 
For nearly two decades, Jamie Warren has been running from darkness. He's haunted by a traumatic childhood and the guilt at having disappeared from his disabled brother's life. But then a series of unusual events reunites him with his estranged brother and their childhood friends, and none of them can deny the sense of fate that has seemingly drawn them back together.
 
Nor can they deny the memories of that summer, so long ago â€" the strange magic taught to them by an even stranger man, and the terrible act that has followed them all into adulthood. In the light of new danger, they must confront their past by facing their futures, and hunting down a man who may very well be a monster.