The game is set in 2137, 15 years after the events of Alien and 42 years before the events of Aliens. It focuses on Ellen Ripley's daughter Amanda who, while investigating her mother's disappearance, is ordered to go to the space station Sevastopol to recover data that could help locate the missing Ripley, unaware that a Xenomorph has already infested the station. Source: Wikipedia, "Alien: Isolation," available under the CC-BY-SA License.