Michael travels to Berlin to visit his ex-girlfriend Gabi. When he arrives there, a vicious virus rapidly starts to spread throughout the city, turning people into zombies with an extreme desire for warm flesh. Upon entering Gabi’s apartment, Michael discovers she is not there. Instead, he meets Harper, a plumber's apprentice, and together they barricade themselves in to protect themselves from the massive hordes of raging zombies. The two then must use all their combined creativity to figure a way out from the apartment alive and find Gabi.