On a planet where there is not water in the oceans, but extremely dangerous organisms, on an island in the middle of the Emerald Sea lives a young man who is not at all happy with his fate - the fate of the only son of the Duke, the future heir to the throne. And one day Charlie has to leave the island: his father takes him away in search of a noble bride in order to enter into a profitable dynastic marriage. Saying goodbye, Charlie promises the young commoner with whom he is in love that he will return and marry her. He promises - and does not return. Instead, the Duke brings a completely different young man, his distant relative, whom he declares to be his adopted son and heir. However, the girl still manages to find out that Charlie was abandoned in the Midnight Sea, the most dangerous of the twelve seas of the planet. And now, in order to go to his rescue, it’s not enough to violate the Duke’s strict ban on leaving the island - you need to invent a way to break it... With color illustrations by the famous fantasy artist Howard Lyon! For the first time in Russian!