This early '70s giallo from director Alfonso Brescia does indeed feature a naked girl killed in a park. Prior to her untimely demise, the woman in question, rich bitch Barbara Wallenberger (Patrizia Adiutori), also sheds her clothes for a romp in the hay with her stable boy Günther (Howard Ross) and gets jiggy with insurance investigator Chris Buyer (Robert Hoffmann), who is on the scene to probe into the mysterious death of her businessman father Johan. Ladies' man Chris also gets to romp in the sack with Barbara's beautiful brunette sister Catherine (Pilar Velázquez), meaning that those looking for some T&A to go with their murder/mystery are more than catered for.
But while Brescia delivers in the boobs and bums department, he doesn't do so well when it comes to the intrigue, the brutality, or the sense of style that is synonymous with the genre. His film is visually bland, the plot is mediocre at best, and the death scenes lack imagination (and gore), making this far from essential viewing for giallo fans. As is usually the case with such films, some fun can be gleaned from trying to figure out who the killer is, although the motive is so abstruse that correctly predicting the murderer's identity is unlikely (it's even harder to guess if watching the atrocious VHS-quality pan and scan version I originally found, which was not just missing most of the nudity, but also the all-important wartime prologue).