Dread permeates the sparkling white concrete facades of Recife's tower blocks in this extraordinary film. A chilling episode from Brazil's past - a military regime's reign of terror - literally comes back to haunt the occupants of a swishy apartment block and those that guard it. Suspicion, mistrust and class divides all add to the mix, effectively building tension before the cathartic and conclusive slam dunk that ties together past and present. A masterpiece.