It is the nightmare of every beautiful young woman; Angela wakes up naked in a strange room and has absolutely no memory of how she got there. She soon discovers she is trapped in an intricate underground labyrinth, and each new chamber holds a challenge for her to overcome.
Meanwhile, above ground, a Private Investigator is desperately searching for the missing woman, and in the course of his investigations he confronts a trio of shady characters and unearths the existence of a mysterious stranger known only as the Secret Master-the evil brain behind a scheme to kidnap young women and force them to take part in his dark game.