As he had foreseen, the idea did not appeal to Miss West in the least.

“You mean,” she hesitated, “you mean to go and stay with Mrs. Erskine, if she will let me, and be a sort of spy in the house?”

“Just so. No, I was afraid it wouldn't do. As a matter of fact, I wish I could have had someone in her villa weeks ago. Only the Yard won't run to needless expenses, you know, and—well, there it is.” He smiled cheerily.

“You think it so important as all that?”

He was quite honest.

“I think it may lead to nothing, but I certainly think it worth trying. If you cared to go, you would be the very person. Mrs. Erskine used to have a companion long ago, I'm told. She might like to have a bright and, if you'll permit me to say so, Miss, a pretty face about her.”

Christine made her decision.

“I'm not going to pretend that it's what I wanted. And I don't think you'd be in the least deceived if I tried to hoodwink you. But I'll go, and if Mrs. Erskine asks me to stop with her I'll do it. I suppose I can always write to you?”

“I should want you to write a report every day and post it to my home address. I may not answer, but I shall get your letters all right, and if there is anything special I want, or that you can do, I shall let you know. You must arrange with some shop in Nice to keep your letters for you. Remember, Miss West, you mustn't forget that there may be enemies in the very household of Mrs. Erskine herself. I have no reason whatever to think so, but you must act as though there were.”

“Do you know anything about her household?”