In a lighthouse on the sea lives a young girl who is about to become a big sister. Trouble is, she doesn’t want a little sister. With her peaceful life disrupted, the girl’s only option is to run away—and build her very own seahouse! With a foghorn for a doorbell and a fence of fishing rope, windows made of sea glass, buoys to help it float — and a pirate flag for safety (of course), she’ll have everything she needs.

The girl imagines all of the adventures she’ll have, talking parrot in tow: harvesting seaweed from her garden; telling ghost stories to merfolk; charting the tides and sailing by moonlight. But there’s a loneliness that creeps in whenever she thinks of her family back on land. And there’s those pesky stormy seas to consider…