I've seen this one and it's really good. Atmospheric little mystery tale with a nice score and some really great performances from the likes of Ugo Pagliai, Massimo Girotti, Rossella Falk etc. TV productions from this time usually feature unattractive video technology and cheap panel sets but this one uses a great deal of location shooting and looks better than expected.
Another Italian TV production from the 70s that I'd recommend is CORALBA (1970), a stylish five-part mystery series in color with Rossano Brazzi, Valérie Lagrange and Venantino Venantini, produced by Oscar Brazzi and featuring an opening theme sung by Frank Sinatra.
You should also check out RACCONTI FANTASTICI (1979), a mini series of four self-contained episodes freely based on Edgar Allan Poe and set in modern times. It has an outstanding music score by the band Pooh and great all-star cast that includes Philippe Leroy, Janet Agren, Nino Castelnuovo, Silvia Dionisio, Dagmar Lassander, Gastone Moschin, Vittorio Mezzogiorno, Erika Blanc and Maria Rosaria Omaggio.
Unfortunately, none of these are available in English-friendly versions.
