My Son (2021) review

A man who works for the oil industry (James McAvoy) is notified his son is missing, so he takes on the role of detective (without any assistance from the actual police) to find him, grilling his ex-wife Joan (Claire Foy) and her fiancé Frank (Tom Cullen) about what happened, and then going on a ravenous search by himself.  This is a remake of Carion's 2017 French movie with the same title and the same behind-the-scenes setup: McAvoy was not given a script to work from, so everything you see is (allegedly) improvised by him ... which isn't a big deal, and I'm sure most audiences without knowledge of this ahead of time wouldn't notice (McAvoy doesn't require tricks to be solid).  What is disappointing is how it "unfolds": Frank's phone conveniently contains every piece of video evidence needed to track the perpetrators and it turns out there's a pedophile ring just hanging around the countryside picking up kids.  I was hoping for something a bit more ... nuanced, you know?