Chapter 51

‘Marlowe told me he opened it,’ said the old man. ‘Yes, that’s so. I bought the whole series—there was a list of them in the back of the first book. I’ve read every word of those books, hunted for every kind of cipher, and neither I nor your great expert, MacNab, could make anything of it.’ Campion stared at him through the darkness. ‘Good Lord, was it one of those we saw?’ he said. ‘We’ll push back at once. I’d no idea you’d left your clue at Mystery Mile.’ ‘It was the safest thing to do,’ the old man pointed out.…