A summer getaway in Montana for Dave Robicheaux's family and friends is violently shattered by the arrival of serial killer and prison escapee Asa Surrette.

Summoned back from a weekend trip when a prominent judge is murdered, FBI agents Dillon Savich and Lacey Sherlock tackle a case during which numerous Washington power brokers are targeted.

Tom Sullivan and Paul Harris are determined to unlock the centuries old mystery behind an ancient Renaissance text before their graduation from Princeton, but just as they are about to discover its secrets, the campus is rocked with a series of suspicious deaths.