A Handful of Stardust (Jake Arnott) BBC Books
A Handful of Stardust (Jake Arnott) 
03/04/2014 BBC Books UK
03/04/2014 BBC Books UK
Only available initially as an ebook.
When a girl called Ali pockets a silver orb that falls from the sky, little does she realise it’s her ticket to seeing the universe! Desperate to retrieve the mysterious object, the Ninth Doctor agrees to let her join him on a dangerous trip to ancient Babylon. Together they must join forces to stop a giant Starman from destroying Earth before it’s too late!
