TROUBLE ON THE HIGH SEAS! Hinata, Mayuka, and Chris are invited to attend a classmate's recital on the luxury cruise ship Primavera. But they were supposed to go home before the ship left port, so why are they now in the middle of the ocean?! And as if that wasn't bad enough, a violin worth millions has vanished from right under their noses! Once again, it's up to Hinata and Chris to catch the culprit and find the missing instrument. But what happens when Chris is taken, too? Will Hinata ever see his beloved dog again?