London, 1975. Robert Laing (Tom Hiddleston) is a young doctor seduced by the lifestyle in a high-rise, an isolated community, cut off from the rest of society in their luxury tower block, and its creator, the architect Anthony Royal (Jeremy Irons). Taking up residence on the twenty-fifth floor, Laing discovers a world of complex loyalties, and also strikes up a relationship with Royal’s devoted aide Charlotte (Sienna Miller). After Laing befriends Richard Wilder (Luke Evans), a documentary filmmaker relegated to the second floor who is determined to provoke the class injustices inherent in the high-rise, a dangerous social situation develops and the high-rise eventually fragments into violent tribes.