R. Austin Freeman, John Thorndyke's Cases — The Stranger's Latchkey (1909)
“ We struck off into the wood, where last year's dead leaves made the footprints almost indistinguishable, and followed the faint double track for a long distance between the dense clumps of bushes. Suddenly my eye caught, beside the double trail, a third row of tracks, smaller in size and closer together. Thorndyke had seen them, too, and already his measuring-tape was in his hand."Eleven and a half inches to the stride," said he. "That will be the boy, Jervis. But the light is getting weak. We must press on quickly, or we shall lose it." ”
