From the beach to the port, to the boat trip to the Island of a Thousand Birds, we reunite with Prune and Robin, who we met in In the Garden, and who set off to explore the coastline and the sea. Packed with details and information, this book tells the story of the beauty and diversity of wildlife and flora, as well as the dangers that today threaten marine balance due to climate change and plastic pollution, among others. We discover the animals, plants, and marine terms – the Beaufort Scale, flag signaling, etc. – the rules of shore fishing, or how a lighthouse works.