Eight people know who the killer is… and they’re all dead! It's a tough beat for San Francisco police lieutenant Jake Martin (Walter Matthau, The Taking of Pelham One Two Three) when he has to investigate a city bus massacre in which a madman opened machine gunfire on eight people. It's even worse when Martin discovers his former partner is one of the victims. But as he investigates the grisly murders, Martin not only discovers unsavory things about his partner, but he finds that many of the victims had shady lives, which shrouds the killer's identity even more. Veteran Hollywood filmmaker Stuart Rosenberg (Cool Hand Luke) directed this action-packed thriller with an amazing cast that includes Bruce Dern (Coming Home), Louis Gossett Jr. (Finders Keepers), Cathy Lee Crosby (Wonder Woman), Anthony Zerbe (They Call Me Mister Tibbs!), Joanna Cassidy (The Package) Val Avery (The Wanderers), Mario Gallo (Revenge of the Ninja) and Paul Koslo (Mr. Majestyk).