The best thing I can say about this minor giallo is that there really IS a naked girl killed in a park. In fact, as per the Italian title there is a COMPLETELY naked girl killed in a park. (There's a couple other naked girls too, but only one of them is killed in a park). That's pretty much the highlight of the movie though.
It starts off in a pretty interesting way with the first-person POV of a funhouse ride which turns out to be from the POV of a dead man!The dead man had just bought a million dollar life insurance, so an intrepid insurance investigator (Robert Hoffman) is called in. He dodges the police investigator on the case (former Bond villain Adolf Celli)and becomes involved with the man's two sexy but neurotic daughters as well as his sexy but neurotic widow (who judging by the looks of her must have given birth to her two daughters when she was about ten). More people die before the final revelation which, unfortunately, is pretty stupid and involves the guilty party delivering a ridiculous soliloquy to a giant portrait of the dead man. It ends back in the amusement park with yet another pretty dumb turn of events.
The lead Hoffman is awful, but Celli is pretty good if underused. The women are pretty, but they're definitely not at the acting level of an Edwige Fenech, Rosalba Neri, or Erica Blanc, or even lesser lights of the gialli like Nieves Navarro or Femi Benussi. Pretty forgettable overall--except for the naked girl killed in park.