Magnus Fin is half selkie -- part human, part seal. When he discovers his initials scratched into the rocks by the shore, he knows his selkie family need his help and an exciting adventure begins.

One ordinary day, Saul is on his way to the corner shop when a girl appears suddenly in the middle of the road. She doesn't understand traffic, or the things in shops, and she's wearing a long dress with ruffled sleeves. Her name is...