In the Shadow of the Moon (2019)

When there was about 30m left, I said aloud (spoiler) "the killer is his own granddaughter and we've never seen the son-in-law because he's black and that could give it away." So, while this starts off strong and the good type of "what the heck is happening??!!!" was running through my mind, it goes on just long enough to turn the big reveal into a big "well, duh."

C+