"That will do admirably, Netta," she said. "Now how had we better send it?"

"I should think that your maid had better take it. You might tell her to ring at the bell, hand it to the woman, and come away at once, without talking, except saying 'I was told to give you this.' Then she would be well away before Mrs. Johnstone had mastered the contents of the note. It had better be sent off at once, for by this time they will be getting in a way."

"I think that I had better send Roberts. No doubt Johnstone himself will be in, and will answer the door; and he might ask Lucy where she came from, and I don't want to tell her anything. Roberts could say that a young woman of his acquaintance, down Chelsea way, asked him to get on a 'bus and leave it for her. He can be trusted, if the man does detain him and ask him questions, to give sensible answers."

The letter was sealed and Roberts called up.

"Take a cab and go down with this to Jermyn Street," Hilda said. "I want it left at that house. If the man who opens the door asks you who you have brought it from, say from a young woman, a friend of yours, in a place down Chelsea way. I don't suppose that he will ask any other questions, and you had best say 'Good-morning,' and saunter off carelessly, as if, having done your errand, you had nothing else on hand. Of course you won't drive up to the door. Leave the cab round the corner, and come straight back here in it."

"All right, miss," he answered.

There was a little look of amusement in the man's face as he glanced at Netta that did not this time pass unnoticed by his mistress. She waited until the door had closed behind him, and then turned sharply on her friend.

"I believe, Netta, you have had Roberts in your confidence all the time, and while we have all been working ourselves into a fever as to where you could be, he has known it all along."

"One cannot work without accomplices," Netta laughed. "It was necessary that someone should make arrangements with the servant there for me to take her place, and who could I trust better than Roberts? I think Colonel Bulstrode's servant helped in the matter; at any rate, they managed it capitally between them. Of course it was Roberts who carried my box out that morning. You must not be angry with him, Hilda, for keeping it from you. I made him promise most faithfully that nothing should induce him to confess."

"I shan't be angry with him, Netta, but you may be sure that I shall give him a little lecture and say that I will have no more meddling on his part, except by my express orders. It is really annoying, you know, to think that all this time we were fretting about you there was Roberts going about laughing in his sleeve."