Ritual In The Dark by Colin Wilson

Set against the backdrop of post-war London, this gripping narrative follows Gerard Sorme, a young man grappling with existential questions and the search for meaning in a seemingly indifferent world. As he navigates the city's underbelly, he becomes entangled with a mysterious artist, Austin Nunne, whose dark and enigmatic nature draws him into a web of intrigue and murder. The story delves into themes of alienation, the quest for identity, and the nature of evil, as Sorme's journey becomes a profound exploration of the human psyche and the thin line between sanity and madness.