Watch The Boo (2018) HD Full Movie Free on solarmovie.do. Watch The Boo (2018) online free. The Boo is a Southern-gothic thriller about a bereaved small town sheriff and his recently widowed, ...The Boo is a Southern-gothic thriller about a bereaved small town sheriff and his recently widowed, estranged, sister-in-law who must acknowledge the external forces they must extinguish to overcome the internal loss of their spouses.