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.

Savich allows Callie Markham, an investigative reporter for The Washington Post, to partner with local Metro Police liaison Ben Raven since she's got the inside track--she's the stepdaughter of the murdered justice. Despite Detective Raven's unwillingness to have a civilian along, Callie Markham ends up riding shotgun to help look for her stepfather's murderer.