Alli Deplecy is about to take part in one of the most dangerous yacht races in the world, but suddenly receives news of the death of her adoptive father Pa Salt. She rushes to her childhood home, where her five sisters are gathering to unveil the will. It is discovered that Pa Salt left each of them encrypted clues about the secret of their birth. But are they ready to solve this puzzle? The story of Alli's birth turns out to be surprisingly connected with the fate of the singer Anna Landvik and the famous play "Peer Gynt", written more than 150 years ago. Allie sets off to meet the icy beauty of Norway, where, as she believes, the mysteries of not only her origin are hidden, but also the identity of the great traveler Pa Solt and... the seventh sister, whom Pa Solt was never able to find at one time.