They killed his brother. Revenge will be unavoidable
Sam Wick finds his brother Nick Wick dead. Slow motion and black and white while Sam is weeping. Sam gives monologue explaining why Nick was a CIA agent killed by terrorists trying to get nukes. Sam sets out for revenge.
Sam meets with the head of the CIA, Agent Hunter Walker Texas Ranger. Hunter Walker Texas Ranger tells Sam where he can find the terrorists who killed Sam's brother.
Sam finds the second in command. He'll know where the man who was responsible for Nick's death is. Epic gun fight ensues. Lots of slow-mo falling. Sam disarms the bad guys and interrogates them and discovers the whereabouts of the leader of the terrrorists.
Sam confronts the leader of the terrorists and his bodyguards. Another epic gunfight ensues all while the terrorist leader is attempting to launch the nukes. Sam kills the leader but the nukes get launched the leader tells Sam that his brothers still alive.
Sam tries to stop the nukes from detonating but then Sam gets shot. Nick appears in the doorway. Sam and Nick have a confrontation, Nick explains that he faked his death and that he was the leader of the terrorists all along. He doesnt want to kill his brother but he must.
Sam kills his brother regretfully. Africa by Toto plays while he drives off into the sunset.