Libido is the kind of film that proves I'm totally justified in obsessively tracking down every Italian horror film I can find in chronological order, because it's a Giallo that fools you into thinking you've got the plot all worked out, then turns it all on its head, then turns it all on its head again, then boots you in the balls with a sufficiently nasty ending.
Christian is one of those unlucky kids who accidentally witnesses his father murdering some floozy in a mirrored room. Seems his dad took a header off a cliff shortly afterwards, leaving his creepy mansion in the hands of Paul until Christian turns 23 in three months time. Now the time is closing in, Christian, and his wife, and Paul, and his really, really ditzy wife all head off to the mansion to do the admin before the fortune falls into Christian's hands.
Paul's wife Bridgette (played by gorgeous Mara Maryl) finds the mirrored room and wants to sleep there, so later on Christian gets an eyeful when she dances in her pants for Paul, while Christian's brain juice is getting all donked up with a mixture of desire, trauma from a flashback, and wondering how six hundred year old actor Pigozzi isn't cracking a fatty right there on screen.
Also it seems that Christian's dad might not be dead at all as his pipe turns up and his favourite chair starts moving on its own (wouldn't be a mid-sixties Italian film without all that crap happening I guess!). So is Christian mad, or is someone trying to drive him mad, or has his father actually returned from the dead to tie up another floozy? This film starts off very intriguing (the credits are played out over various images of the murdered woman) and then fools you into thinking it's a mediocre Scooby Doo type thing before making you care about characters you were suspicious about from the start. I only spotted one single clue in the dialogue that may have pointed to the ending but that was that. So many twists in this one and the dark ending makes this one of the best Gialli from the sixties I've watched so far. They should have given Luciano Pigozzi bigger roles like the one he as here - He ditches the 'Igor' type act that he had in Terror Creature From the Grave and comes across as initially a bad guy to a guy perhaps discovering too late that he been made a mug of.
One last note: Dario Argento must have had his notebook out for this one - children witnessing murders, creepy toys, kid's music - all of these turn up in Profondo Rosso!