“The Harrow” (*1/2 out of four) was a harrowing bore about an unstable guy (Tom McKay) in a nowheresville town whose sanity is on the fringes after the murder of his wife a decade earlier; when a new girl (Maggie Geha) arrives in town trying to uncover the truth about her mother’s death, they soon fall in love but find that the mysteries of their past have interlocking secrets. Potentially interesting Southern Gothic melodrama is undone by molasses pacing and overlength. Geha and McKay’s sincere performances are wasted.