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, a subsidiary of Vivendi Universal Games. J.A.C.K. (Just Another Contract Killer) is set in the time frame between the events of the original No One Lives Forever and No One Lives Forever 2.