Eighteen-year-old Simon (Bill Skarsgård) is a boy with Asperger's syndrome who likes space, science and circles. His world is suddenly turned upside down when his older brother Sam (Martin Wallström) breaks up with his girlfriend. In order to cope with daily life, Simon needs things to follow a certain pattern with the same schedule week after week. Sam has always been the one to take care of Simon, but with Sam depressed over the breakup and not maintaining the regular routine, Simon's world is turned upside down. Wanting things to get back to normal, Simon decides to find Sam a new girlfriend. He knows nothing about love but he has a scientifically perfect plan.