Siete orquídeas manchadas de sangre

Despite some unfavorable reviews (notably Adrian Smith's), this is a classic giallo that really works. The puzzle of the half moon lockets is classic Edgar Wallace and is the tenuous thread that connects the set-piece murders and keeps the story moving. Sabato and Glass race around to solve the mystery and clear Sabato's name but, as per usual, the killer is one step ahead of them. It all ends in a hand to hand fight in a swimming pool that's a cut above the usual giallo climax, and everything is nicely resolved. In 1972 plot still mattered to the giallo genre (1973's Torso would change that) and the films were a lot better for it. This one goes high on the list of gialli and was a peak for Umberto Lenzi.