Hell Is Empty — Conrad Williams

Private Investigator Joel Sorrell is exhausted and drinking hard, sustained only by a hopeful yet baffling note from his estranged daughter, Sarah. An SOS from an old flame whose child has been kidnapped gives him welcomed distraction, but the investigation raises more questions than answers. Then comes the news that his greatest enemy has escaped from prison with a score to settle. With Joel's life and the remnants of his family at stake, any chance of peace depends on the silencing of his nemesis once and for all. But an unexpected obstacle stands in his way…