Thirty-year-old twins Jenna and Joni find out that their father has a third child. Sister Jóna lives in Iceland. The siblings' meeting will change everyone's world, relationships and future. As each searches for meaning in their own lives, surging between one father, two homelands and three adult siblings, from reunification to separation and back again. Over the years, the siblings encounter themselves and each other, their similarities and differences.
A year after a subglacial volcano erupts, mysterious elements from prehistoric times emerge from the melting ice, bringing unforeseen consequences.