The drowning pool

the long version

"Relocated to a coastal town, widowed teacher Sarah Grey is slowly rebuilding her life, along with her young son Alfie. But after an inadvertent séance one drunken night, her world is shaken when she starts to experience frightening visions. She tries to dismiss them. But Alfie sees them too and Sarah believes that they have become the targets of a terrifying haunting. Convinced that the ghost is that of a 19th Century local witch and namesake, Sarah delves into local folklore and learns that the witch was thought to have been evil incarnate. When a series of old letters surface, Sarah discovers that nothing and no-one is as it seems, maybe not even the ghost of Sarah Grey…"-- Publisher description.