Mac is called to Jack's hangar, but when he comes there, Jack is gone. The only clue leads to a cemetary. Mac goes there, thinks that he sees Jack, but suddenly he's trapped underground - by Murdoc.
Murdoc asks Mac for help in locating his sister, whom he has kept secret for all years, but who's now been kidnapped by Murdoc's old employers: a cartel of assassins-for-hire.
Mac and Murdoc attempt to sneak into the cartel's club, using Halloween costumes and a secret meeting between the leaders of the cartel.
But just as they think they have found the sister, they are caught in deadly gauntlet...