The demons never tire.
They cling to John Callahan, and, like the banshees of Irish legend, they fill his heart with wails of despair. But, no matter how he tries to live an exemplary life, the former IRA killer is haunted by memories of the horrors he has suffered — and those he has inflicted in return. Not the monastic life, not the vows of the priesthood, not even the move from Ireland to New York City has brought him peace.

In this second novel in the series by Elizabeth Upton, Callahan has resigned from the priesthood in the hope of living a simpler life as a professor at New York University. However, his promise to a distraught colleague — who soon turns up dead — plunges him into another mystery alongside his friend Ronald Casey, a detective with the NYPD.

Who would want to kill a professor of neuroscience? What is contained in the briefcase that she has guarded, quite literally, with her life? Soon it seemed clear that Dr. Shannon Grey Feather had discovered a cure for addiction and several complex brain disorders.

That is a medical breakthrough worth millions — and is it worth killing for? 

Once again confronted by murder's cruelty and life's injustices, Callahan must find a killer while coming to terms with his criminal past. He longs for true peace and genuine love, but before he can hope for a bright future, he must revisit his dark past — where those demons dwell.