Thanks as always to the magnificent team at Pan Macmillan, and to my agent Sara Menguc and all her associates. I’m delighted that Dr James Grieve was prepared to appear as himself. He knows that my grasp of his subject is weak and will make allowances. My friends in Shetland have been as helpful as always and I’d particularly like to thank Maurice Henderson of Shetland Islands Council, Jim Dickson and Ingirid Eunson. Ian Best and Lise Sinclair from Fair Isle gave invaluable help on building yoals. Any mistakes are mine.