You came to your wife that is working on the huge corporation, but some people decided to rob them. Stop them and save the hostages from the terrorist gang.
What can terrorist demand? Money, of course! But John McClane cares nothing but the lives of people who were taken as a hostages. Considering the fact that John is a stubborn and tough cop, he will never back and terrorist have problems. Kill them one by one when they will try to catch you and find their leader at the end.