Patrick Kenzie and Angela Gennaro’s latest client is a prominent Boston psychiatrist running scared from a vengeful Irish mob. The hardboiled private investigators know something 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 a serial killer’s long-dormant secrets erupt, setting off a chain of violent murders that will stain everything―including the truth.