The Jeffersonian team is traumatized by Sweets's fatal shooting, but determined to do the late Lance justice by catching the killer. Booth takes charge with nerdy fellow FBI agent James Aubrey. They find his killer, a military vet, on a nearby roof, apparently fatally shot himself, but actually sneakily knife-stabbed to death, expertly. Blackmail in high DC circles keeps blocking their legal moves, almost driving Booth to illegal vengeance, but Hodgins thinks of a zoological model to chart the chain of blackmail since Hoover. Thus the FBI agents find evidence to sustain the hypothetical family tree of secrets-sustained super-scoundrels.
—KGF Vissers