"It is for to-night," he began. "Please to attend carefully to what I am going to say, Mr. Walters, and on peril of your life, for it is a dangerous matter,--on peril of your life I say, follow these instructions to the letter. You understand? Well, to-night at about half-past seven you will stroll quietly up the Hampstead Road till you come to Vincent Street. Turn down here and walk along, taking the third turning to your right, which is Lambert Terrace. Then follow the terrace, cross the road, and go along Hertford Street, and so into Lillington Square. The second turning you will come to in the square is called Sheen Street; but in reality it is more a passage between blank walls than a street. Whatever you do, take care to be at the corner of this street at eight o'clock precisely. You will walk along it, and just at the bend, where you lose sight of the square, you will find an old gentleman with white beard and whiskers. He will in all probability be abusing a cabman for having brought him to Sheen Street instead of Chenies Street. You will go up to him quietly and offer your services; he will tell you where he wants to go, and you will be so courteous as to offer to show him the way. I may say that Professor Memys moved into Chenies Street a month ago; thus Mr. Headley has never been to see him there, and moreover he is very short-sighted, and knows little of the topography of London. Indeed he has quite lived the life of a learned hermit at Audley Hall. "Well, need I say more to a man of your intelligence? You will bring him to this house; he will ring the bell, and a servant in quiet livery will let him in. Then your work will be done, and I am sure done well. You will leave Mr. Headley at the door, and simply continue your walk, and I shall hope to see you the next day. I really don't think there is anything more I can tell you."