ISBN-13: 9781849417983 / Angielski / Miękka / 2013 / 128 str.
William resents going on a 'boring' holiday to Wales, but while there he is let into a big secret by Gwyn, a local boy. Gwyn has found a seal pup and has it hidden in a cave. He makes William promise never to tell anyone about it, and plans to breed it on a farm.