This month's Doctor Who eBook from Puffin will be written by Young James Bond author Charlie Higson. The book will be available for download on September 23rd and all the stories will be available in a collected edition in November. Here is the synopsis.
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!