Classic martial arts action. Chen Chen (Bruce Lee) returns to Shanghai for the funeral of his martial arts mentor, who died in suspicious circumstances. Whilst he is mourning his old friend, members of a rival school arrive and taunt Chen and his friends, who do not react at first. Chen later visits the rival school and humiliates them by beating every single one of them, but this causes bloody repercussions and begins to uncover the real reasons behind the mentor's death.