Contract J.A.C.K. is a prequel to the 2002 computer game No One Lives Forever 2: A Spy In H.A.R.M.'s Way. It was developed by Monolith Productions and published by Sierra Entertainment. J.A.C.K. is set in the time frame between the events of the original No One Lives Forever: The Operative and No One Lives Forever 2, and follows John Jack, a professional killer recruited by H.A.R.M., a criminal organization central to the No One Lives Forever series.