Summer of night / Dan Simmons.

Enhanced descriptions from Syndetics:

This masterfully crafted horror classic, featuring a brand-new introduction by Dan Simmons, will bring you to the edge of your seat, hair standing on end and blood freezing in your veins

It's the summer of 1960 and in the small town of Elm Haven, Illinois, five twelve-year-old boys are forging the powerful bonds that a lifetime of change will not break. From sunset bike rides to shaded hiding places in the woods, the boys' days are marked by all of the secrets and silences of an idyllic middle-childhood. But amid the sundrenched cornfields their loyalty will be pitilessly tested. When a long-silent bell peals in the middle of the night, the townsfolk know it marks the end of their carefree days. From the depths of the Old Central School, a hulking fortress tinged with the mahogany scent of coffins, an invisible evil is rising. Strange and horrifying events begin to overtake everyday life, spreading terror through the once idyllic town. Determined to exorcize this ancient plague, Mike, Duane, Dale, Harlen, and Kevin must wage a war of blood--against an arcane abomination who owns the night...