Join the shadowy Carapace Clavicle Moundshroud as he takes eight trick-or-treaters on an unforgettable journey to find their missing friend, Pip. Travel through space and time, from the tombs of ancient Egypt to the gargoyles of Notre-Dame Cathedral, all the way to the cemeteries of Mexico on el DiÌ?a de Los Muertos, the Day of the Dead. Is Pip still alive? And if so, can his friends save him from a ghastly fate before it's too late?

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.