The Operative No One Lives Forever is a first-person shooter video game with stealth gameplay elements, developed by Monolith Productions and published by Sierra Entertainment. Some time in the 1960s, Cate Archer is the only female agent in the service of U.N.I.T.Y. a worldwide secret espionage agency. Having been relegated to menial tasks over the years, Cate is finally given a chance to prove herself when a terrorist organization called H.A.R.M. starts to knock off active field agents.

Under the qualification of being available as a trained agent, Cate is given the authority to track down and investigate these H.A.R.M. activities. In missions around the globe, Agent Archer will find herself sniping assassins, stealing documents, and doing a host of other suitably sneaky, often deadly espionage tasks.