Richard Montanari is my new favorite mystery author. Merciless is his 6th novel. His books are about two homicide detective partners from Philadelphia: Kevin Byrne and Jessica Balzano. I like the bond that is between both of these characters. Very supportive and caring. Both are descendants of cop families. Byrne is divorced with a deaf-mute teenage daughter that he adores. Jessica is part-time pro boxer who is married to a pretty-boy vice cop, who once strayed from his wedding vows, and is trying to save their marriage. They have a precocious 5-year old daughter. Montanari's books are always quick-paced and I usually read them at one or two sittings. Merciless is set in Philadelphia; which can be rough city with a high crime rate. At times there is a lot of irony in it being known as the City of Brotherly Love. Merciless is about a serial killer with a Hans Christian Andersen fetish. If you like mysteries with good character development and a lot of suspense, you enjoy this book.