'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.
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Used availability for Andrew Norriss's The Touchstone
May 2004 : UK Paperback
August 2005 : UK Audio CD
December 2004 : UK Audio Cassette