“And do you seriously mean to tell me that you believe us to be responsible! Do you blame us because something has gone wrong with your window-frame, or because the noises in the street disturb you in the morning? They disturb me too. I can rarely sleep after five o’clock, but I have certainly never dreamt of blaming you for the fact. You cannot possibly mean that you think—”

“I do more than think: I am as sure as it is possible to be. It is no ordinary street noise which wakens me, but something much nearer, and more jarring. It appears to be immediately outside my window, and it happens once each morning—and only once—sometimes at five, sometimes later, sometimes earlier still. With regard to the tapping, it has never happened before; and so far as I am aware, nothing is wrong with my window. I believe, as I said before, that both these noises are the result of intention, not accident.”

Philippa looked at him steadily with her bright, dark eyes. “And suppose,” she said quietly—“suppose I tell you in return that you are entirely mistaken, and that we have nothing to do with either one or the other. What then? Will you refuse to believe me?”

The two stared at one another in silence, like combatants measuring strength for a fight. It was the man whose eyes were the first to fall, the man who first showed signs of relenting.

“Of course, if you give me your word, Miss Charrington, I am bound to take it.”

“Then I give you my word, Mr Neil, that we are absolutely innocent of annoying you in the way you describe.”

The Hermit bowed, laid his hat on the table, and fumbled nervously with his coat.

“I can only say that the matter is most mysterious and annoying. Perhaps, however, you will be willing to promise that in other respects you will be more considerate for the future, so that I may be able to work with less disturbance from the noise overhead?”

“I am afraid I cannot see my way to giving any such promise, for I fail to see how we can be quieter without interfering with our own duties. I have three sisters, and music is the profession by which one of them hopes to make a living. If she gave up practising it would seriously injure her prospects. The others are busy all day long, and naturally wish for a little relaxation at night. Although you give us no credit for consideration, I may tell you that we are constantly calling our young brother to order in case he should disturb you, but I should not feel it right to make home dull and cheerless by forbidding any noise whatever.”