Title: The Diabolist (Dominic Grey #3) by Layton Green
Published June 4, 2013; Thomas & Mercer
Genre: thriller, phenomenology
They called themselves the House of Lucifer. Thirty minutes before midnight High Priest Matthias Gregory swung wide the doors to Red Abbey and one by one the members filed inside.Publisher description: "In this gripping thriller, the bizarre murder of a Satanic priest in San Francisco draws Dominic Grey and Viktor Radek, private investigators of cults, to the scene. Witnesses claim a robed figure, seemingly able to appear and disappear at will, set fire to the priest. When the leader of another Satanic cult in Paris dies under similar circumstances, the case only grows stranger… and more dangerous.
The Diabolist is a chilling novel that mines a trove of fascinating historical, philosophical, and paranormal research to probe some of our closest held beliefs. From the opening pages to the astonishing conclusion, this latest installment in one of today’s most original new thriller series."
This is the third in the series. I especially liked his first novel, The Summoner. I have also reviewed his The Egyptian.