48537    'It is he, then, who is our enemy - it is he who dogged us in London?'

48538    'So I read the riddle.'

48539    'And the warning - it must have come from her!'

48540    'Exactly.'

48541    The shape of some monstrous villainy, half seen, half guessed, loomed through the darkness which had girt me so long.

48542    'But are you sure of this, Holmes?

48543    How do you know that the woman is his wife?'

48544    'Because he so far forgot himself as to tell you a true piece of autobiography upon the occasion when he first met you, and I dare say he has many a time regretted it since.

48545    He was once a schoolmaster in the North of England.

48546    Now, there is no one more easy to trace than a schoolmaster.

48547    There are scholastic agencies by which one may identify any man who has been in the profession.

48548    A little investigation showed me that a school had come to grief under atrocious circumstances, and that the man who had owned it - the name was different - had disappeared with his wife.

48549    The description agreed.

48550    When I learned that the missing man was devoted to entomology the identification was complete.'

48551    The darkness was rising, but much was still hidden by the shadows.