When a supposed air marshal is murdered on a flight to the District of Columbia, Mac searches the plane for the killer and the murder weapon.

When a buzzard flying over Manhattan drops a human eyeball from its claw, the race is on to find the body it belongs to before the avian saboteur flies away with the rest of the evidence.

In the culmination of a multi-episode mystery, Mac and his team uncover the dark lair of a murderous madman, the Compass Killer. But as they race to save his fourth victim, the sunrise presents one final surprise that no one ever expected.