“I was already firmly convinced, Watson, that there were not three separate mysteries here, but one only, and that if I could read the Musgrave Ritual aright I should hold in my hand the clue which would lead me to the truth concerning both the butler Brunton and the maid Howells. To that then I turned all my energies. Why should this servant be so anxious to master this old formula? Evidently because he saw something in it which had escaped all those generations of country squires, and from which he expected some personal advantage. What was it then, and how had it affected his fate?

“It was perfectly obvious to me, on reading the Ritual, that the measurements must refer to some spot to which the rest of the document alluded, and that if we could find that spot we should be in a fair way towards finding what the secret was which the old Musgraves had thought it necessary to embalm in so curious a fashion. There were two guides given us to start with, an oak and an elm. As to the oak there could be no question at all. Right in front of the house, upon the left-hand side of the drive, there stood a patriarch among oaks, one one of the most magnificent trees that I have ever seen.

“‘That was there when your Ritual was drawn up,’ said I as we drove past it.

“‘It was there at the Norman Conquest in all probability,’ he answered. ‘It has a girth of twenty-three feet.’

“Here was one of my fixed points secured.

“‘Have you any old elms?’ I asked.

“‘There used to be a very old one over yonder, but it was struck by lightning ten years ago, and we cut down the stump.’

“‘You can see where it used to be?’

“‘Oh, yes.’

“‘There are no other elms?’

“‘No old ones, but plenty of beeches.’

“‘I should like to see where it grew.’

“We had driven up in a dog-cart, and my client led me away at once, without our entering the house, to the scar on the lawn where the elm had stood. It was nearly midway between the oak and the house. My investigation seemed to be progressing.

“‘I suppose it is impossible to find out how high the elm was?’ I asked.

“‘I can give you it at once. It was sixty-four feet.’

“‘How do you come to know it?’ I asked in surprise.

“‘When my old tutor used to give me an exercise in trigonometry, it always took the shape of measuring heights. When I was a lad I worked out every tree and building in the estate.’

“This was an unexpected piece of luck. My data were coming more quickly than I could have reasonably hoped.

“‘Tell me,’ I asked, ‘did your butler ever ask you such a question?’

“Reginald Musgrave looked at me in astonishment. ‘Now that you call it to my mind,’ he answered, ‘Brunton did ask me about the height of the tree some months ago in connection with some little argument with the groom.’

"And do you feel sure of succeeding?"

"Pardieu!" exclaimed the man in the cloak, suddenly expressing himself in French.

"What did your excellency say?" inquired the other.

"I said, my good fellow, that I would do more single-handed by the means of gold than you and all your troop could effect with stilettos, pistols, carbines, and blunderbusses included. Leave me, then, to act, and have no fears for the result."

"At least, there can be no harm in myself and party being in readiness, in case your excellency should fail."

"None whatever. Take what precautions you please, if it is any satisfaction to you to do so; but rely upon my obtaining the reprieve I seek."

"Remember, the execution is fixed for the day after tomorrow, and that you have but one day to work in."

"And what of that? Is not a day divided into twenty-four hours, each hour into sixty minutes, and every minute sub-divided into sixty seconds? Now in 86,400 seconds very many things can be done."

"And how shall I know whether your excellency has succeeded or not."

"Oh, that is very easily arranged. I have engaged the three lower windows at the Cafe Rospoli; should I have obtained the requisite pardon for Peppino, the two outside windows will be hung with yellow damasks, and the centre with white, having a large cross in red marked on it."

"And whom will you employ to carry the reprieve to the officer directing the execution?"

"Send one of your men, disguised as a penitent friar, and I will give it to him. His dress will procure him the means of approaching the scaffold itself, and he will deliver the official order to the officer, who, in his turn, will hand it to the executioner; in the meantime, it will be as well to acquaint Peppino with what we have determined on, if it be only to prevent his dying of fear or losing his senses, because in either case a very useless expense will have been incurred."

"Your excellency," said the man, "you are fully persuaded of my entire devotion to you, are you not?"

"Nay, I flatter myself that there can be no doubt of it," replied the cavalier in the cloak.

"Well, then, only fulfil your promise of rescuing Peppino, and henceforward you shall receive not only devotion, but the most absolute obedience from myself and those under me that one human being can render to another."

"Have a care how far you pledge yourself, my good friend, for I may remind you of your promise at some, perhaps, not very distant period, when I, in my turn, may require your aid and influence."

"Let that day come sooner or later, your excellency will find me what I have found you in this my heavy trouble; and if from the other end of the world you but write me word to do such or such a thing, you may regard it as done, for done it shall be, on the word and faith of" --

"Hush!" interrupted the stranger; "I hear a noise."

"'Tis some travellers, who are visiting the Colosseum by torchlight."

"'Twere better we should not be seen together; those guides are nothing but spies, and might possibly recognize you; and, however I may be honored by your friendship, my worthy friend, if once the extent of our intimacy were known, I am sadly afraid both my reputation and credit would suffer thereby."