Big waste of time. The initial premise is vaguely interesting, as a strange cloud seems to be doing weird things to people in a small French surfing town. (One person can heal with his hands, one has a speeded up pregnancy, etc.) Is this science fiction or a supernatural story? Neither, really, as it's mostly just a boring soap opera about boring people. Also totally not credible, because if something like this happened in the real world, everyone everywhere would know about it in 48 hours thanks to the Internet, and the town would have been deluged with health department officials, scientists, journalists, kooks, tourists, etc. Instead, the locals are all on their own as they spout pseudo-scientific gibberish and New Age platitudes. Probably inspired by the success of the French TV series The Returned (Les Revenants), but that show was infinitely better--genuinely spooky and mysterious, and never boring, thanks to interesting moral dilemmas and much more interesting actors. This one is just awful.
Review of La dernière vague
