After losing the family fortune to a fraudulent psychic, inventor Henry Strauss is determined to bring the otherworld under control through the application of science. All he needs is a genuine haunting to prove his Electro-Séance will work. A letter from wealthy industrialist Dominic Gladfield seems the answer to his prayers. Gladfield’s proposition: a contest pitting science against spiritualism, with a hefty prize for the winner. The contest takes Henry to Reyhome Castle, the site of a series of brutal murders decades earlier.

Psychic medium Vincent Night and his lover, Henry Strauss, have spent months striving to uncover the dark secret harbored by Vincent’s dead mentor, James Dunne. Their only clue comes from a journal: Dunne was seeking to restore the Grand Harmonium, an artifact meant to breach the walls between life and death. Fate seems to intervene when Henry and Vincent are offered a job investigating the haunted orphanage where Dunne lived as a youth. But the ghosts of the orphanage don’t rest easily....

Between his bullying father and dissolute brother, Percival Endicott Whyborne has quite enough problematic family members to deal with. So when his sister returns to Widdershins asking for help solving the mystery of a derelict ship, Whyborne is reluctant to get involved. Until, that is, a brutal murderer strikes, leaving Whyborne and his lover Griffin no choice but to take the case. The investigation leads them deep into a conspiracy of blackmail, murder, and darkest sorcery.

Introverted scholar Percival Endicott Whyborne has spent the last few months watching his lover, Griffin Flaherty, come to terms with the rejection of his adoptive family. So when an urgent telegram from Christine summons them to Egypt, Whyborne is reluctant to risk the fragile peace they've established. Until, that is, a man who seems as much animal as human tries to murder Whyborne in the museum. Amidst the ancient ruins of the pharaohs, they must join Christine and face betrayal, murder, and a legendary sorceress risen from the dead.

Whyborne's lover, dashing ex-Pinkerton detective Griffin Flaherty, agrees to prove Allan's innocence. But when Allan is deemed insane and locked away in the Stormhaven Lunatic Asylum, Griffin finds himself reliving the horrifying memories of his own ordeal inside a madhouse.