The Host Rides Out (Celia Rees Supernatural Trilogy)

Paranormal activity is creating chaos for all who live and work in the city, and Davey is more alert than his sister and cousins to voices from the past. Will the ghost hunter brought in to investigate uncover the root of the problem, or is his very presence a trigger for evil sprits to make themselves known? And now Davey must be on his guard as never before—his nemesis, The Lady, has returned; he must escape her deadly clutches by Midsummer or be in her thrall forever.