There are 2 books in the Persons Non Grata series. The newest book is A Song for Quiet which came out in 2017.

Cassandra Khaw bursts onto the scene with Hammers on Bone, a hard-boiled horror show that Charles Stross calls "possibly the most promising horror debut of 2016." A finalist for the British Fantasy award and the Locus Award for Best Novella!

John Persons is a private investigator with a distasteful job…

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A Song for Quiet

Book cover of A Song for Quiet
Deacon James is a rambling bluesman straight from Georgia, a black man with troubles that he can't escape, and music that won't let him go. On a train to Arkham, he meets trouble - visions of nightmares, gaping mouths and grasping tendrils, and a madman who calls himself John Persons.…