Watch Castle in the Ground (2019) HD Full Movie Free on solarmovie.do. Watch Castle in the Ground (2019) online free. After the untimely death of his mother, a teenager befriends his charismatic but troubled next-door ...After the untimely death of his mother, a teenager befriends his charismatic but troubled next-door neighbor and becomes embroiled in a world of addiction and violence just as the opioid epidemic takes hold of their small town.