After one of its members witnesses a political assassination, an outlaw motorbike gang becomes the target of a string of murders, prompting a cop to join their ranks to determine who is responsible.
Stone is a 1974 Australian outlaw biker film written, directed and produced by Sandy Harbutt. It stars Ken Shorter and features Rebecca Gilling, Bill Hunter and Helen Morse. The film follows police officer Stone, who goes undercover with the outlaw motorcycle gang the Gravediggers to find out who is murdering their members one by one.