As our review explains, Outlast's DLC picks up where the main game left off, i.e. with your heartbeat pounding. "Everything in Whistleblower is turned up to 11," Joystiq's Jess Conditt screamed as she sprinted down the hallway, "the blood, the twisting layout of the building, the number of bodies hanging from the rafters, the nudity and the sexual exploits of the patients of Mount Massive Asylum."
If you yet to complete the game, you really should. After all, nice guys finish Outlast*.