In 2005, Vanessa Mitchell moved into her dream home, a former medieval jail where England’s witches waited to hang and burn. When paranormal phenomena forced her to flee, she became convinced it was possessed by evil spirits. This is her true story. — St. Osyth is a cursèd little village in the county of Essex, 83 miles east of London, at the edge of the North Sea. The town’s 4,600 souls live in medieval cottages arranged around a 12th Century monastery, and in cheap mobile homes that the British call caravans. St. Osyth’s…