A landscape of myth and mystery is interwoven with rural life in South West Scotland in 1928-1942. Helena Hailstanes is sick of the secluded life her father, Sam, forces her to live on the shores of Loch Duie. She runs away and encounters Megan, who as a muddled and meddling young Sea Witch cursed Helena and Sam, creatures of an ancient race of shape-shifting otters, to remain in human form. Now she's in the Women's Land Army with Megan in her life again, this time meaning well but causing chaos, Helena embarks on a course with the potential to harm both herself and others. It is the discovery of her true nature which is her salvation, as Helena chooses to make her way in the world on her own inimitable terms.