It’s the Saturday of Memorial Day weekend, May 23rd, and the small town of Promise Falls, New York, has found itself in the midst of a full-blown catastrophe. Hundreds of people are going to the hospital with similar flu-like symptoms—and dozens have died. Investigators quickly zero in on the water supply. But the question for many, including private investigator Cal Weaver, remains: Who would benefit from a mass poisoning of this town?