The Brotherhood of Light and Darkness (Hardcover) by Jason Augustus Newcomb

Alexander Sebastian is an armchair occult enthusiast who lacks much direction in life, but his world is turned upside down when his police detective brother-in-law asks him to help identify some magical symbols scrawled at a ritualistic homicide. He becomes obsessed with the crime and finds himself drawn into the underground modern magick scene. He encounters an odd array of characters- an obese, narcissistic drug-peddling adept, a coke-snorting sex magick dominatrix, a pontificating Freemason with a lisp and many others. But who is responsible for murder? The story is inspired by Newcomb's real-life adventures in actual secret magical societies. This is a look at the true world of magick from the inside.