In a walled garden surrounded by skyscrapers, Father Michael Birney met an unholy end, stabbed by an assailant who invaded his vespers prayers and then vanished as twilight overtook the big city. A stone's throw from the crime scene, a congregation of Satan worshipers chants its disturbing incantations - an irony not lost on Detectives Carella and Hawes, who search among the cultists for a kill...