Patrick Kenzie and Angela Gennaro’s latest client is a prominent Boston psychiatrist, running scared from a vengeful Irish mob. The private investigators know about cold-blooded retribution. Born and bred on the mean streets of blue-collar Dorchester, they’ve seen the darkness that lives in the hearts of the unfortunate. But an evil for which even they are unprepared is about to strike, as secrets that have long lain dormant erupt, setting off a chain of violent murders that will stain everything – including the truth.