The Weekend Murders (Concerto per pistola solista, "Concerto for solo pistol," 1970)
Italian pastiche/parody of classic English murder mysteries. Starts with the discovery of a corpse in a sand trap on a golf course. We find out this is the third murder, and go into a flashback.
In traditional form, a bunch of relatives show up at the mansion of a recently deceased rich guy for the reading of the will. Among the bunch are the dead man's sister and her disturbed adolescent son; the deceased fellow's estranged daughter and her husband; a ne'er-do-well nephew and his wife (who shocks everybody else because she happens to be a Black woman); and maybe some others not as memorable. Living at the mansion is the dead man's niece, who took care of the fellow and, it is soon revealed, gets all his wealth.
The first two "murders" are quickly shown just to be gruesome pranks by the disturbed adolescent, but real killings soon follow. First is the butler. Since the others think, at first, this is only another practical joke, somebody says "At least we know the butler didn't do it."
The rest of the film is full of clues, red herrings, and others traditions of the genre. There's even a locked room mystery. On the case are a Scotland Yard detective and a rather goofy local police sergeant. At first, it seems that he's just going to be the comic relief, but he very cleverly solves the case. Besides spoofing Agatha Christie style whodunits in an affectionate manner, there are a couple of scenes that poke fun at the giallo genre.
The first fake murder is extremely bloody, in the style of that form, but the real killings are almost bloodless. A couple of scenes have our usual mysterious person with black gloves skulking around, but they both turn out to have nothing to do with the murders. (One of them is the disturbed adolescent making the world's clumsiest pass at the sexy maid who, against all expectations, welcomes his advances. This causes the poor virginal guy to panic, hallucinate his mother laughing hysterically at him, and run away screaming.)
It's quite an enjoyable film, that works both as a witty comedy and a clever mystery.