Callum Doyle Books in Order

The Callum Doyle novels drop readers into the noise and pressure of New York, seen through the eyes of a detective who never quite does what he is told. Callum Doyle is an Irish immigrant working homicide for the NYPD, quick with a sarcastic line and driven by a fierce sense of loyalty that often lands him in trouble.(burnleyexpress.net)

In Pariah that loyalty is turned against him. His partner is murdered in a deserted lot, then other people connected to Doyle start dying in calculated attacks. Anonymous messages warn him that anyone he goes near will be killed. Forced to cut himself off from friends, colleagues and even his own family, Doyle has to investigate while staying at arm's length from everyone he cares about.(barnesandnoble.com)

The Helper finds him dealing with an anonymous caller who offers clues to a string of murders on one condition: Doyle cannot tell anyone he is being fed information. The first victim, a young woman killed in a New York bookshop, carries a cryptic mark that ties directly back to him. Each new call raises the stakes, leaving Doyle to decide whether keeping the secret is saving lives or costing them.(simonandschuster.com)

In Marked a young woman in the East Village is brutally assaulted and murdered, and Doyle becomes convinced he knows who is responsible. The problem is that the evidence refuses to co operate. The more he pushes his prime suspect, the clearer it becomes that the man is willing and able to strike back in twisted ways, while an old adversary reappears with demands that could destroy what Doyle has left.(books.apple.com)

Cry Baby brings the series to a more intimate kind of horror. Erin Vogel wakes after a brutal attack to find that her six month old daughter, Georgia, has been taken. Given a chance to get her baby back at a terrible price, she discovers how far she might go when pushed beyond fear. Doyle watches her choices with growing alarm, knowing that his own intervention could make the outcome better or much, much worse.(books.apple.com)

Throughout the Doyle books Jackson keeps the pace high and the tension tight, but what lingers are the questions about cost and consequence. Doyle cracks jokes, bends rules and acts on instinct, yet he is constantly measuring the damage done to the people around him. That mix of action, moral dilemma and New York atmosphere gives the series its edge.(barnesandnoble.com)