Ionna is a selkie torn between sea and shore. She has waited years for the chance to find the son stolen by the mysterious woods on her island.
When Viking raiders threaten her village, she must choose between returning to the sea, saving one of her children, or risking everything to protect them all.
Forced into an uneasy alliance with a Viking beserker, Ionna races to escape a ruthless warlord who needs one of her children to reshape the world to his vision and discovers that survival may demand more than sacrifice, but trust.