The Doctor punched a control and the holographic Eye vanished, to be replaced by a hologram of what Grace could only guess was the universe. It was beautiful – millions of dots of colour, swirls of gas clouds, yellow suns...

‘There’s no context,’ muttered the Doctor. ‘I’ll have to check.’

‘What are you doing?’

The Doctor was hunched over the console, his fingers tapping in commands, slipping golden squares and rods in and out of slots. ‘I’m setting the coordinates for one minute after midnight. If I’m right, the Eye has already been open for too long and there is no future.’ He shot a look at Grace. ‘I only hope –’

He stopped as the hologram of the universe flared and vanished. ‘Oh, no...’