In the depths of the legendary Loch Ness, a family tale unfolds.

Local fisherman Mylo claims to have been attacked by the Loch Ness monster, and who runs a tourist show on the banks of the loch. His teenage daughter Kellina doesn’t believe his stories, nor does she believe in any of the myths of Loch Ness... but that all changes when she meets an actual, young Nessie named Fin.