The Hole in the Ground (2019)

Trying to escape her broken past, Sarah O'Neill is building a new life on the fringes of a backwood rural town with her young son Chris. They move to a new home in the Irish countryside, next to a forest that hides an enormous sinkhole. One night, Chris vanishes, and when he reappears, he seems unharmed and unchanged. But, as his behavior grows increasingly disturbing, Sarah begins to fear that the boy who has returned may not be her son at all.