A tiny island off Scotland, surrounded by deep blue sea... an ideal place for a group of international scientists to take a break... But lying innocently on the strand was a single red pebble... Pog found it. His older sister Mee and her new-found friend, Train, discovered its remarkable powers...
Used availability for Nicholas Fisk's Antigrav
April 1978 : UK Hardback
January 1982 : UK Paperback