The Celia Rees Supernatural Trilogy Series by Celia Rees

Twelve-year-old Davey discovers the exceptional power of his sixth sense when he explores the ancient underground city in his hometown. Here he confronts both good and bad spirits and one evil shapeshifter who follows him back to his own time to bring him to his death.

The second part of a supernatural trilogy, this book finds Dave trying to forget the scary events of last summer. When he encounters a face from the past it brings the memories flooding back, along with some bad news. Soon Dave, his sister and cousins are once again battling the forces of evil.

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.