The fort

the long version

"During the waning summer days of 1987, a deranged Vietnam vet stalks Grand Rapids, Michigan, abducting and murdering nameless victims from the streets, leaving no leads for police. That is, until he picks up sixteen-year-old Molly. From their treehouse fort in the woods, three neighborhood boys spy the killer holding a gun to Molly's back, they go to the police--only to have their story disregarded. But the boys know evil lives in their midst. A growing sense of honor and urgency forces the boys to take action--to find Molly, to protect themselves, to stand guard for the last long days of summer."--Publisher's website.