Chapter 36

"'Now, sir, the sun cannot lie. I went down there this morning and measured things, and do you know how long it takes for that shadow to move that distance? One hour and five minutes. That second photograph was taken at twenty minutes past ten, when Ronald Vane can be proved to have been in his own house. The other shadow is the murderer all right, but it's not Ronald Vane.' "'Good God!' he said. 'Good God!' "A narrow shave I think you'll agree," went on the speaker after a moment. "And a shave which--given a roll …