What have you done to Solange? is certainly one of the better italian giallo films of the early 1970s and is definitely worth watching if you have any interest at all in italian cinema. However, the film is quite obviously a low budget affair, and you should be prepared for the usual cheap effects, so-so dubbing, and strange plot twists that are a feature of the genre.
What first grabs the interest is that the film is set in England, with most of the action revolving around a catholic school for girls. One of the schoolgirls is murdered on the bank of the Thames and the murderous action is partially seen by another pupil who is being seduced by the sports teacher in a rowing boat drifting past the bank. The murder turns out to be the first of several, and as you would expect a range of suspects come and go and more than a few plot twists are paraded before you before the identity of the murderer and the motive is finally revealed.
What makes this stand out from the giallo pack is that despite there being some loose ends and lack of sharpness in defining the plot, the plot does actually make reasonable sense at the end, and the murderer's motive is fairly believable.
The other notable feature of the film is the presence of Camille Keaton, famous for being Buster Keaton's neice, and infamous for starring in the execrable 'I Spit on Your Grave', and Christine Galbo, who starred in 'The Living Dead at The Manchester Morgue'. Of the two Galbo puts in the better performance, although that can partly be explained by the particular demands of the part played by Keaton.
Overall then, the film is worth watching if you are really into thrillers, italian cinema, or even just for a nostalgia trip in looking at the old cars and as a reminder of how things used to be. This may be faint praise, but the film does have enough to keep you watching for the duration, and there is enough to it to be enjoyable if you don't view it with high expectations.
This US DVD version is not exactly laden with extras. You get some still pictures and images of the film's promo posters and that is about it. The transfer is from a pretty good print though and the film does look fairly sharp and clean as a result. Please note that it is a region 1 NTSC DVD so your player will have to be multi-region capable.