The Way to Impossible Island

What was a girl from the Stone Age doing here? Now? This summer Dara was finally going to have his Big Operation. Finally he'd be able to row out to Lathrin Island. Finally he'd have adventures. But then the op is delayed. Again. And Dara knows that for him adventures will always be just silly dreams. Impossible. Then he meets Mothgirl. She's really impossible. She wears animal skins and has a pet wolf. And she's afraid. When she desperately tries to swim to the island alone in the dark, Dara has to let go of impossible and let adventure find him.