Robbie is a very ordinary boy with a very extraordinary talent, who lives in the city of Corliol.
He loves astronomy, and often sneaks into his local cathedral grounds to search the stars.
One night he stumbles upon a whole new world, and encounters one of the Guardians of Corliol – a talking mouse called Jan.
He soon finds himself on a dangerous quest to save the starlight ceiling from a gang of criminal cats, led by the sinister Satan and his sidekick Lucifer.
Will Robbie be able to help the mice defeat them – and avoid his father finding out where he's been all night?