A U.S. Marshal escorts a government witness to trial after he's accused of getting involved with a mob boss, only to discover that the pilot who is transporting them is also a hitman sent to assassinate the informant. After they subdue him, they're forced to fly together after discovering that there are others attempting to eliminate them.
Spenser, a former Boston patrolman who just got out from prison, teams up with Hawk, an aspiring fighter, to unravel the truth behind the death of two police officers.
