The UAC has been running experiments on demons — again — and has, predictably, lost contact with the facility conducting those experiments. Your job is to clear it out. A failsafe complicates things: the complex's exit cannot be opened until the full experimental test regimen has been completed. That means you also need to shepherd the test subject through to the end of the protocol without letting it die, because if it dies, your only way out is as what the game charitably describes as "chunky giblets." A comedic first-person shooter about being trapped in a situation that is both very violent and very procedural.