The Missing by Sarah Langan

A remote and affluent Maine community, Corpus Christi was untouched by the environmental catastrophe that destroyed the neighbouring blue-collar town of Bedford. But all that will change in a heartbeat…

The nightmare is awakened when third-grade schoolteacher Louis Larkin takes the children on a field trip to Bedford. There in the abandoned woods, a small, cruel boy unearths an ancient horror― a contagious plague that transforms its victims into something violent, hungry… and inhuman.

The long, dark night is just beginning. And all hope must die as the contagion feeds― for the malevolence will not rest until it had devoured every living soul in Corpus Christi… and beyond.