The Touchstone — Andrew Norriss

'Anything you want to know, you hold the stone, ask me, and I will give you the answer'. Douglas is not the sort of boy to panic when something out of the ordinary happens. But, when he meets a native of the planet Vangar whose arm has dropped off and needs his help, and who is being hunted by the Guardians of the Federation, well, even Douglas finds things a bit of a strain.