A business party aboard a party boat takes a turn for the worst when a fired employee returns to his boss wanting revenge by taking him at gunpoint. But the hostage situation quickly ends when a body comes flying down from nowhere, crashing into the hostage taker. Mac finds evidence supporting his theory that the man either fell or jumped from the 59th Street Bridge, and the team believes the man is The Compass Killer’s latest victim. Meanwhile, Don is attacked while AWOL from work.