"Circumstantial evidence is a very tricky thing" answered Holmes thoughtfully. "It may seem to point very straight to one thing but if you shift your own point of view a little you may find it pointing in an equally uncompromising manner to something entirely different. It must be confessed however that the case looks exceedingly grave against the young man and it is very possible that he is indeed the culprit. There are several people in the neighbourhood however and among them Miss Turner the daughter of the neighbouring landowner who believe in his innocence and who have retained Lestrade whom you may recollect in connection with the Study in Scarlet to work out the case in his interest. Lestrade being rather puzzled has referred the case to me and hence it is that two middle aged gentlemen are flying westward at fifty miles an hour instead of quietly digesting their breakfasts at home."