Ratman (1988)

Ratman (Italian: Quella villa in fondo al parco) is a 1988 Italian exploitation horror film directed by Giuliano Carnimeo.

Plot
Two models, Marlis and Peggy, are on a Caribbean Island for a photoshoot. One night Peggy is found dead and her body seems eaten by rats.

The victim's sister, Terry, arrives on the island and helped by a mystery novel writer met at the airport starts to investigate. Meanwhile, Marlis and the photographer find other corpses in the jungle. Searching for a help they stopped at an isolated house just to discover that the landlord is a scientist who created a ferocious mutant half-ape, half rat.