The year is 1557. The royal ship Tre Kronor is on a secret mission. Its destination: the legendary island of Rulantica, where the source of life is said to be found.
Like all the sailors aboard, ship’s boy Fin hopes this unique mission will bring him honor and fame. This only makes his disappointment more bitter when he has to stay on board while the captain and other sailors head to the island to find the source and to fill their water.