An under-rated entry into the genre...
Seven Blood-Stained Orchids (Sette orchidee macchiate di rosso) (1972) - Umberto Lenzi 
Like Fulci, Lenzi also directed some seminal gialli before the Italo-cannibal and zombie cycles started to dominate the directors' work throughout the '80s. 'Orchids' benefits from the influence of Edgar Wallace, who provided the bones of the story to which this giallo was moulded around. Add to this tight and tense plot some of the usual trappings including bloody kills and buxom maidens and you have the makings of a great little giallo Whilst Lenzi will unlikely be remembered for this particular film, it is certainly one of his best, in my opinion, and a fine giallo where the genre is concerned.
Out of print (?) but still available for fairly reasonable prices, the US Shriek Show DVD is the best way to go for this one. However, this is definitely a film that could do with a re-release due to its availability.