The brilliant young physicist Henrik and his fellow students develop a fusion reactor that produces endless clean energy, potentially saving Earth from environmental catastrophe. The reactor, however, is harnessed for commercial use, and the consequences for the planet and society are devastating. By the year 2064, the world has been ravaged by climate change. The UN succeeds in developing a form of time travel that can return a person's memories and personality to the moment of birth. Henrik is sent back to the past in an attempt to prevent the escalation of a catastrophe before it is too late. Something goes wrong and Henrik is forced to begin his mission from a very different starting point to the one he is used to.

Raised in a small town, Antti and Suvi meet at a house party and fall in love, start a band and move to the capital. The more successful the band is, the worse their relationship gets. Their relationship ends and the band breaks up. Suvi becomes internationally successful solo artist Summer Maple. When Antti meets the determined Elisa, who aspires to become a lawyer, there is the promise of a new direction in life. But Suvi and music won't leave him alone. One night, Antti's doorbell rings: Suvi has come to ask him to come with her to New York to record a new album.

After losing her father, Vilma can't find her place in the life of her foster family. As a result of her struggles, Vilma ends up in a juvenile home, where she refuses to be subdued by the arbitrary and abusive staff who run it.