"Hawaii, Oslo" is the story of a handful of people who cross each other's path without necessarily knowing each other, during the hottest day of the year in Oslo. We follow Frode and Milla. They are having their first child, who they are told will not live long. We follow Bobbie-Pop, a faded singer who tries to commit suicide. We follow Leon, an institutionalized kleptomaniac who is waiting for the arrival of Åsa, to whom he has a ten year old deal to get married. We meet Leon's brother, Trygve, who fetches Leon at the institution to celebrate his birthday, but who himself has plans to use his leave from prison to run away. And most of all we meet the angel Vidar, Leon's best buddy at the institution, who sees things no one else can see, and who may be able to save everyone.