International title: Go Gorilla Go
Tonino Valerii
In order to get hired as a bodyguard by wealthy engineer Gaetano Sampioni, former stuntman Marco Sartori stages a mock kidnapping with the help of his friend Ciro, which he then foils by himself. Marco's plan is successful and he becomes Sampioni's "gorilla". The engineer is being threatened with anonymous phone calls and letters, which demand a huge amount of money, and the construction sites he's working at are sabotaged. To keep Sampioni from paying the mob, Marco kidnaps the engineer and hides him in a safe place, and sets up a trap with a police, which is a failure. Marco finds out that Ciro is involved with the racket, and persuades him to arrange a meeting with Berto, the biker, but falls into a trap in an abandoned palace, and miraculously escapes with his life ...