Summary

Fred Williamson co-directs and stars in this thriller as Detective Mack Derringer. When his ex-wife (Vanity), a phone-sex worker, starts receiving obsessive phone calls from a stalker who killed her co-worker, she turns to Mack. He joins forces with his partner Lenny (Gary Busey) and friend Jake (Peter Fonda) to find and take down the psychopathic caller. Isabel Sanford and Robert Forster co-star.