The mermaids of Lollyland, who usually sing all the time, have fallen silent. And Itty Bitty Princess Kitty is on the case. Working with mermaids can be tricky, though-- they mostly keep to themselves and dont like to be disturbed. But Itty manages to befriend a mermaid named Aria, who confesses that someone has been singing and its making the mermaids too confused to carry on their own songs! Can Itty help the mermaids uncover the mystery musician?