"This is the best news I have heard for some time," he said. "You can make your mind quite easy on one thing--Anstruther has nearly shot his bolt. After to-morrow I will get you to arrange a meeting between myself and my old friend at the Great Metropolitan Hotel. Meanwhile, there is much to be done. It is quite certain that great things are going to happen at the City and Provincial Bank to-night. I think we shall have a pleasant little surprise for Anstruther and Co."

Seymour rose, and took a roll of tissue paper from a small safe in the corner of the room.

"These are the plans of the City and Provincial Bank," he explained--"the plans that came so luckily into our hands last night. I have studied them very carefully. As a matter of fact, I did not come straight home last night, but passed the hours till nearly daylight prowling about the bank. Without the plans, my scheme would be quite futile; but I think now that I have the whole thing very prettily mapped out. Just come and look at this with me. It is really very simple."

As Seymour had said, the plan was simplicity itself. It not only gave a very intelligent idea of the situation of the vaults and strong rooms, but also the back premises and the lanes behind were clearly marked.

"Now I want you to follow this very carefully," Seymour went on. "We can ignore the front of the building altogether, because that faces on Gresham Street. Here the police pass the same premises every three minutes, so that nobody could force an entrance that way, not even the would-be burglars with their keys. But if you look at the rear of the place, you will see that there is a small alley leading out of Farringdon Lane, and this alley ends by a kind of back entry into the bank which is used by the caretaker. I have ascertained that there are two night watchmen, so that there is not much danger of trouble. By the side of this door is a small window, the latch of which I have ascertained to be defective.

"I suppose no one has ever troubled to see to this, for the simple reason that admission to the bank premises by no means implies getting to that part of the building which is devoted to business purposes. Not that we particularly want to penetrate very far, because it is our scheme to watch what is going on, so that we may be able to confront the scoundrels when the proper time comes. A careful examination of these plans shows me that we shall be able to get as far as the bank proper, which means the counting house, and from thence down the steps to the vaults where the strong rooms are situated."

"Have you got keys of all these?" Jack asked.

"There will be no necessity for us to provide keys," Seymour chuckled. "You see, Anstruther and Co. will be bound to enter the bank from the back premises. By learning this plan off by heart, we come to know exactly which way they will get to the vaults. Of course, they will come provided with keys--Carrington will see to that. All we have to do is to hide under a counter or something of that sort, and wait till our friends come along. Naturally, they will not dream that any one is on the premises besides themselves. As to the rest, you must leave that to me and fortune. You had better stay here and dine, and we can set out for the City about eleven o'clock."

It seemed to both Rigby and Masefield that it would be impossible to improve upon this plan. They dined comfortably and discreetly, and it was somewhere about half-past eleven when they turned their faces in the direction of the City. No one appeared to notice them, for they walked rapidly along, with the air of men who had business before them, and the police appeared to be few and far between. They came at length to the little alley at the rear of the bank, and here it behoved them to be cautious. They waited till the beat of the policeman's feet died away down the lane, and then they darted down the dark entry. Seymour produced a tiny electric torch from his pocket.

"There is the window," he whispered. "I am going to get on your shoulders, Mr. Rigby. Once I am through, I can pull you others up. There is no sort of danger."