Inspector Tellini investigates serial crimes where victims are paralyzed while having their bellies ripped open with a sharp knife.

A rogue scientist near a small desert town arouses the suspicion of the town's doctor when his lab assistant is found dead from a case of acromegaly, which took only four days to develop. As the doctor investigates, aided by the scientist's new female assistant, they discover that something is devouring local cattle and humans in increasingly large quantities.

Lupin is framed for the murder of Inspector Zenigata by a mysterious assailant holding a silver-coloured Walther P38 pistol Lupin himself once owned. Tracking the true killer leads Lupin to the island of the bloodthirsty Tarantula assassins inside the Devil’s Triangle. After joining the spider-tattooed army against their will, Lupin and his gang make both new friends and enemies as they not only plan to take home the Tarantulas’ massive gold repository for themselves, but hunt down the shooter from Lupin’s past. Can Lupin put to rest this demon who haunts his memories with the Walther P38?

A disturbed teenage girl unleashes her pet tarantula against her "enemies."

Arthur, a university professor, and former political activist, lives in France with Francesca. They decide to hire a young man in order to help the teacher organize his notes. The employee leaves his girlfriend Ingrid and moves in with the couple.