"When Shawn Sorenson drowned in 1987, no one in La Crosse, Wisconsin, took much notice. They thought it was simply another drunken accident. When another student, Tad Schwartz, drowned a year later, the residents began to suspect foul play. Why else would a healthy young man drown? Even so, the police had no leads or clues to suggest anything other than a tragic accident. Were these truly accidental deaths? Suspicion became reality one fateful morning in 2011 when Police Detective Allan Rouse, Sheriff's Deputy Charlie Berzinski, and pathologist Rick Olson pulled the 15th victim from the river. The body had a tale to tell. Dr. Olson, physician Patricia Grebin, and researcher Sarah Giles discover an obscure piece of evidence. It leads Berzinski and Rouse down a tangled trail of clues before reaching a mindboggling conclusion. Will Berzinski and Rouse catch the killer before its too late?"