Political speechwriter Becca Matlock is at the top of her professional game, working for the re-election campaign of New York's popular governor, when she receives the first phone call: "Stop sleeping with the governor or I'll kill him."

A long weekend in the Poconos is cut short when Sherlock and Savich are helicoptered back to Washington to lead the investigation into the brutal murder of a Supreme Court justice.

The explosive action kicks off as FBI agent Ruth Warnecki hunts for Confederate gold in a West Virginia cave. She never expects to encounter the grisly murder that catapults her into a horrific plague of death, all centered on the prestigious Stanislaus School of Music.

When six-year-old Sam Kettering is kidnapped and then manages to save himself, Savich and Sherlock join his father - former FBI agent Miles Kettering - to determine why Sam would be abducted and brought to eastern Tennessee. Though the local sheriff, Katie Benedict, catches up with Sam before the kidnappers do, the case isn't over - not by a long shot.

When FBI agent Dane Carver's twin brother, Father Michael Joseph, is brutally murdered in his San Francisco church, husband-and-wife agents Lacey Sherlock and Dillon Savich take a personal interest in the investigation. Nicola "Nick" Jones, a homeless woman and the only witness to the shooting, is scared out of her mind because she is trying to hide from her own monsters.