STALKER: Call of Pripyat is the third game in the STALKER series, a trio of open-world survival-horror FPS games set in the irradiated "Zone" around the Chernobyl Nuclear Power Plant in Ukraine, following a fictitious second blowout in 2006. As a result of all the radiation (and other mysterious forces), the Zone has become an inhospitable place full of violent mutants and dangerous scientific anomalies -- small, localized spaces that defy the laws of physics, like gravity wells that pull you off the ground and rip you to pieces, or spots of earth that shoot fire when you step on them. Some of the mutants have even developed powers of telekinesis, invisibility, and mind control. The only people who venture into the Zone are scientists looking to study the anomalies, and treasure hunters known as "stalkers" hoping to find valuable "artifacts" contained in and around anomalies, which bestow their carriers with special powers like accelerated blood clotting or extra strength.
Call of Pripyat follows the events of Shadow of Chernobyl, in which you, as an amnesiac stalker known as the "marked one," managed to disable a device called the "brain scorcher," which had been keeping people from reaching the center of the Zone. With the demise of the brain scorcher, the Ukrainian government launched a series of helicopters to survey the area in preparation for a large-scale military raid on the CNPP. All five of the helicopters crashed in the Zone before reaching the CNPP. You play as Major Degtyarev, member of the Ukrainian Security Services, on an undercover reconnaissance mission investigating the helicopter crashes. You begin the game on the outskirts of the Zone in the Zaton swamps, before advancing to the Yanov Railway station and Jupiter manufacturing plant, and eventually, reaching the city of Pripyat itself.