A Mysterious Shipwreck Cornwall, today: Arthur Drake at last has some time to think about the Invisible Detective and a past life that seems somehow linked to his own. But then he meets the ghosts of sailors shipwrecked over a century ago… An Extraordinary Watch London, 1937: Whatever your problem, the Invisible Detective can find the answer. But no one suspects that he's just a front for four children who solve crimes and mysteries in his name. A pocket watch that seems to rewind time itself leads the children to investigate a strange clock shop. What is wrong with the shop's customers? How are events linked to a shipwreck in Cornwall? Where has Meg vanished to? It is up to the Invisible Detective to find out.