Cornell Woolrich
After the commercial success of "giallo" films by Dario Argento, Lenzi followed the new trend with "Seven Bloodstained Orchids", which referenced both Cornell Woolrich and Edgar Wallace novels, while another "giallo" "Knife of Ice" was a variation of Robert Siodmak's "The Spiral Staircase". Other "gialli" created by Lenzi in the early 1970s included "Spasmo" and "Eyeball".