Outlast: Whistleblower (also known as Outlast: Story DLC) is a psychological horror video game DLC (Downloadable content) for Outlast, developed and published by Red Barrels Games. It is the prequel to Outlast, revealing the reasons of the Mount Massive Asylum outbreak. It also shows the true ending to the asylum after Miles' (implied) death. It was released for PlayStation 4 and PC.
Whistleblower will let you play as Waylon Park, a software engineer under contract with Murkoff and the man who emailed journalists around the world - including Miles - at the beginning of Outlast. Spending a couple of weeks at Mount Massive, during which he was unable to even talk to his wife and son in Boulder thanks to strict security protocols, Waylon developed a deep-seated distrust of the profit-motivated scientists and doctors leading dangerous and irresponsible experiments on their patients. Identifying with those poor souls fueled Waylon's anger, and set the stage for his unmasking of Mount Massive's rotten core.
Although Whistleblower tells the story that led to Outlast, it actually stretches past the events of the first game to show the final chapter in Mount Massive Asylum's story.