Six months after starting their hunt for a serial killer who is still at large, FBI agents Jerry Lee Parker and John Flynn are partners in every sense. But Jerry has serious doubts about their relationship and whether they would even be together if not for the way Flynn changed after touching a mysterious artifact in a museum. Flynn hates the extraordinary power bestowed on him by the artifact and wants nothing more than to have a normal life again. Jerry fears that without the unusual connection they forged, Flynn will no longer want or need him. Chasing after a similar artifact takes them back to Flynn's old stomping grounds in Washington D.C., where his newfound abilities uncover long-buried secrets, the kind people would kill to protect. But they aren't the only ones looking for these powerful relics, and what they discover will threaten their relationship—and their lives.