The second part of a fascinating series of books for children about adventures underwater and above water!During a school trip, Lena, Fritz and Marie hear a legend about ancient treasures, among which Poseidon's amulet is of particular value. Driven by curiosity, the friends decide to go in search of the treasure, but they encounter a real sea witch! They understand that something terrible will happen if a powerful artifact falls into the wrong hands. Lena, Fritz and Marie must find the amulet first!Christiane Rittershausen has worked for many years as an editor of children's and teen books, and all this time she has been inventing her own universe with sea princesses, fortune-telling jellyfish and submarines.The publication will delight fans of the cycle "Children of the Sea".The book is suitable for readers over 8 years old.