Ill Will

"In 1983, Dustin Tillman's family--his parents and his aunt and uncle--were murdered in a shocking massacre. His foster brother, Rusty, was convicted of the crime, in a trial that was steeped in the "Satanic Cult" paranoia of the 1980s. Thirty years later, Rusty's conviction is overturned, and suddenly Dustin, now a psychologist, must question whether his testimony that imprisoned his brother was accurate. When one of his patients, an ex-cop, gets him deeply involved in a series of unsolved murders, Dustin's happy suburban life starts to unravel, as his uncertainties about his past and present life begin to merge"--

Synopsis from Open Library.