Christian is a divorced father who likes to spend time with his two children. Popular curator of a contemporary art museum in Stockholm, he drives an electric car and supports humanitarian causes. He is preparing his next exhibition, entitled "The Square", around an installation encouraging visitors to be altruistic and reminding them of their duty towards their fellow human beings. But sometimes it's hard to live up to your values: when Christian's mobile phone is stolen, his reaction does him little credit. At the same time, the museum's communications agency launches a surprising campaign for The Square: the response is totally unexpected and plunges Christian into an existential crisis.