Five-year-old Sól and her father live in an isolated house by the sea. Sól spends lonely days with her imagination while her father, a composer, struggles with his music. When Sól senses that her father is burdened by sorrow, she finds solace in an old Icelandic folk tale.

Uniform Sierra was filmed in Snæfellsnes in Iceland and features Sigríður Soffía Níelsdóttir dancer/choreographer and Benjamin Khan circus artist dancing in a hot spring but most of the film takes place under water.