When the British Government receives a horrifying terrorist threat signifying Scorpia's return, Alan Blunt and the Department begin to hunt for their old enemy. Meanwhile in Malta, Alex follows the trail of the shady scientist working for them to his secret laboratory aboard a decommissioned ship.

Cut off from his friends and forced to work with one of his greatest foes, Alex endures a punishing induction to Scorpia, and must face off against a gang of ruthless trainee assassins.