Description: Yumi dreams about a strange coffin she opens with her flute playing. Just such a coffin leads them to the planet of the Sirens. But space pirates kidnap the children to force Ulysses and Nono to face the Sirens to get a map. Yumi has a strange dream in which by playing a certain tune on her flute she opens a sealed coffin. Soon after she tells the others about her dream, they encounter a stone coffin next to a wrecked spaceship. Ulysses brings the coffin aboard and Yumi opens it by playing the tune from her dream. Inside is the body of a spaceman clutching a circuit card. When they insert the card into the Odyssey's computer they find that it is a map of the nearby Sirenum system and a message tells of a complete map of Olympus that is guarded by the Sirens. They go in search of the map but when they land on the planet they discover a host of wrecked spaceships and are captured by space pirates. They force Ulysses and Nono to face the Sirens and get the map by holding the children hostage. Can Ulysses resist the Siren's song?