CSI Crime Scene Investigation

After a body falls from the 59th Street Bridge, the CSI team finds a compass near the body pointing east, and realizes it's the third victim of the "Compass Killer."

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.

The team looks into the death of a wealthy racehorse owner after he dies during a race. Meanwhile, Horatio learns that Ryan has a connection to the case.