It actually is.

Now you see," she continued, "it's like this.

That letter you wrote him"-- she addressed herself to Mona--"it has to be changed.

You have got to rewrite it, and you must put into it these four bank-notes.

Then when you see him again you must have that letter opened at exactly the right moment, and--oh, I wonder if you will do it exactly right!" she added dubiously to Mona.