Through an heirloom music box, Leo, a serious, responsible boy, and his badly-behaved cousin Mimi enter the magical world of Rondo to rescue Mimi's dog from a sorceress, who wishes to exchange him for the key that allows free travel between worlds.

On the disastrous night when the ocean liner Titanic sinks, the sounds of a pig-shaped music box cheer children escaping in a lifeboat.

An old, silent music box has strangely begun to play its tune, and when Anya Ivanovich asks for the Phantom Finders' help, Abby and Theo follow the trail of clues to Murky Creek's once-ornate theater, the Kirby Center.

A young Mexican American girl accompanies her father to a swap meet, where she hopes to sell her music box for money for dancing lessons.