He or she will ask to see me.

Finding I am away this person, whether man or woman, will try to have an interview with either you or Mabel, and will endeavor by every means to get my address.

Mabel, knowing nothing, can reveal nothing, and you, Kate, you are to put the stranger on the wrong scent, to get rid of the stranger by some means, and immediately to telegraph to me.

My address is in this closed-up envelope.

Lock the envelope in your desk; open it if the contingency to which I have alluded occurs, not otherwise.