A Stranger Came Ashore — Mollie Hunter

When Finn Learson staggers out of a stormy sea into a village on the Shetland Isles, he brings a secret with him. While the other villagers are enchanted by the stranger, Robbie suspects he's hiding something. Haunted by tales of the Selkie Folk, Robbie sees the clues everywhere -- the strange coin, the missing ship, Finn's love for Robbie's sister and her golden hair. But can Robbie convince the others in time to save his sister?