The House of Lost Souls — F.G. Cottam

Just weeks after four students cross the threshold of the derelict Fischer House, one of them has committed suicide and the other three are descending into madness.

Nick Mason's sister is one of them. To save her, Nick must join ranks with Paul Seaton--the only person to have visited the house and survive. But Paul is a troubled man, haunted by otherworldly visions that even now threaten his sanity.

Desperate, Nick forces Paul to go back into the past, to the secret journal of beautiful photographer Pandora Gibson-Hoare and a debauched gathering in the 1920s, and to the dark legacy of Klaus Fischer--master of the unspeakable crime and demonic proceedings that have haunted the mansion for decades.

Because now, the Fischer House is beckoning, and some old friends have gathered to welcome Paul back. . . .