All who reside in the Irish village of Ierne know the legend of the Seal Woman; a fae who lost her husband and children to the villagers and vowed that she would bring about the downfall of Ireland itself. Several centuries later, softspoken Ronan lives in fear of the sea, until one day one of its inhabitants - a lost Selkie named Mairin - becomes his only friend.

A Croatian girl is reborn as a Rusalka after accidentally falling off of her father’s ship, awaking in Iriy, the Slavic otherworld. With her motley crew of companions, she must travel across Iriy to ask the Rozhanitsy (the Slavic deities of fate) to change her destiny and send her back home.