Ellie Jordan's job is to catch and remove unwanted ghosts. Part detective, part paranormal exterminator, Ellie operates out of Savannah, Georgia - the most haunted city in the United States. When a family contacts her to deal with a disturbing presence in the old mansion they've recently purchased, Ellie first believes it to be a typical, by-the-book specter, a residual haunting by a restless spirit. Instead she finds herself confronting an evil that is older and more powerful than she'd ever expected.

Kit McCafferty's life is quiet, unremarkable, and filled with cat hair. In the magical city of Coldstream, located on the border between Scotland and England, Kit is viewed as little more than mildly eccentric and mostly harmless. She passes her days caring for her family of five cats, feeding the local feral moggies, and maintaining relatively good relations with her neighbors. All that changes, however, when a teenage werewolf shows up at her door in the desperate hope of renting out a nearby vacant flat.

Hundreds of feet beneath the ocean's surface, a graveyard waits. Years ago, the SS Arcadia vanished without a trace during a routine voyage. Though a strange, garbled emergency message was broadcast, neither the ship nor any of its crew could be found. Sixty years later, its wreck has finally been discovered more than three hundred miles from its intended course: a silent graveyard deep beneath the ocean's surface, eagerly waiting for the first sign of life.

As the daughter of spiritualists, Mara's childhood was filled with séances and scam mediums. Now she's ready to start over with her fiancé, Neil, far away from the superstitions she's learned to loathe, but her past isn't willing to let her go so easily. And neither is Blackwood House. When Mara and Neil purchased the derelict property, they were warned that ever since the murder of its original owner, things had changed. Strange shadows stalk the halls. Doors creak open by themselves. Voices whisper in the night. And watchful eyes follow her every move.

The cemetery is alive with faint, spectral shapes, led by a woman who died before her time…and Keira, the only person who can see her, has become her new target. Determined to help put the ghost to rest, Keira digs into the spirit's past life with the help of unlikely new friends, and discovers a history of deception, ill-fated love, and murder.