Sergio Martino was not before on my list of giallo directors to look out for, but after Your Vice, he definitely will be. This film is tightly shot and paced, with hardly any lulls in the story and almost every scene has importance to either the plot or the arc of the characters. There is murder, of course, and free-flowing and sometimes perverse sex, but that never detracts from the core story around Oliviero and Irina. Oliviero's niece Floriana comes into the story later, manipulating both of them to her own gains. Complex characters, a tight plot, and a murder mystery - the perfect recipe for a truly engaging and entertaining movie.
As a giallo film, I was expecting lots of lavish and beautiful death scenes. I was a tad disappointed in that regard, with only a few neck and chest slashings, but they were still filmed to look very pretty. Fausta's throat being cut was probably the most well done out of all of them, while the long gash from Brenda's chest to her stomach was too obviously a prosthetic. The bright red paint serving as blood, a giallo staple, is a great image and helps to overlook the fact that the other special effects are sometimes not up to par with the rest of the film. After Satan the cat kills some of Irina's beloved pet doves, she goes a little crazy and stabs out one of the animal's eyes. Subsequent scenes of Irina's obsession with the cat wanting revenge on her show a ghastly bloody hole where his eye used to be. It doesn't look all that real, but it's certainly memorable and gets the job done.
Your Vice is a Locked Room and Only I Have the Key was more than a welcome surprise. I never know what I'm going to get with some of these giallos, but several times I have been happy that I gave them a chance. This was a great find, and I hope that there are many others like it out there.