Bad Moon Rising by Ed Gorman, 321 pages

A hippie commune has invaded Black River Falls. While the majority of the townspeople believe that the bohemians have the right to stay, there is a minority that constantly accuses them of everything from criminal activities to Satanism. As usual, lawyer and private investigator Sam McCain finds himself in the middle of the controversy, especially when the teenage daughter of Paul Manwaring, one of the town's wealthiest men, is found murdered in the commune's barn. A deeply troubled young man named Neil Cameron is immediately charged with the crime, but Sam has serious doubts.