In the rollicking, unrated fourth installment in the popular franchise, gung-ho cop John McClane (Bruce Willis) goes interface to interface with technoterrorists plotting to hack into government computers and bring the country to a standstill. Justin Long costars as a computer geek helping in McClane's quest, and Timothy Olyphant is the smooth-talking brains behind the crime. Directed by Len Wiseman. Maggie Q, Mary Elizabeth Winstead.