The Pyjama Girl Case
La ragazza dal pigiama giallo (original)
Starring Ray Milland, Dalila Di Lazzaro, Michele Placido, Mel Ferrer, Howard Ross, Enzo Staiola
It's a mystery and thriller movie, and has a rating of 6.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from France.