Ralph Sarchie is a Sergeant in the New York Police Department, working at the 46th precinct in the South Bronx. During his 16 years on the force, patrolling some of New York City's most dangerous slums on the midnight tour, he's made over 300 arrests and received seven medals. For the past ten years, he's moonlighted as a demonologist, investigating haunted houses and cases of demonic possession. A devout Catholic, he's assisted in 20 exorcisms. He lives in Queens, New York, with his wife, Jennifer, and their two children.

Lisa Collier Cool is an award-winning author of four previous books and hundreds of articles for such magazines as Glamour, Good Housekeeping, Ladies Home Journal, and Penthouse. She lives in New York with her husband, John, and their three children.