Shock Waves

Mack Bolan persuades a Mafia target to betray the brotherhood, as a trade for a new life in the federal witness program. But the Mob snatches the informant before he has a chance to "sing."
The trail of the traitor leads the Executioner to New York, where the local don is holding court to pick a Mafia monarch for the vacant throne.
Bolan crashes the coronation dinner to find the head of the snitch on the royal menu.