Suske and Wiske is a classic Flemish series by author and illustrator Willy Vandersteen. His successor was Paul Geerts, who also wrote and illustrated this volume. Lambik gives Sidonie a strange coconut for her birthday, which he bought for her at a flea market. Sidonie is not thrilled, and Lambik is upset. Everything changes when they find a pirate's treasure map inside the coconut. Lambik travels to the Seychelles during the pirate era using Professor Barabas' time machine, with Sidonie, Suske, Wiske, and Wastl following him, as they rightly believe he is in danger.