All in all, one of the best Franco's movies, having a plausible story (albeit with some plot holes) and a quite convincing performance by the actors.
As in many other movies from the same director in that period, there is no shortage of skin display by female actresses (the scrumptious Martine Stedil and the inevitable Lina Romay), perhaps encouraged by the apparent tropical climate of a place that is looking a lot like Nice in southern France (despite it being declared Porto Santo in the narration). Indeed, the main location is Beaulieu-sur-Mer, a seaside village on the French Riviera between Nice and Monaco.
Italian audience will perhaps recognize Paul Konrad Müller (as Inspector Mendoza) who played Fantozzi's "megadirettore galattico" in some pictures of the 80s.