She saw that the amount totaled a little over twenty-five dollars, and she considered that a very extravagant sum for a boy in Johnny's humble circumstances to spend for a lot of junk which she could see no sense in at all.
Having set herself to the solving of a mystery, she examined carefully the blue print laid uppermost on a thin pile of his lessons and circulars.

There were pencil markings here and there which seemed to indicate a special interest in certain parts of an airplane.

There was a letter, too, from Smith Brothers Supply Factory.

She hesitated before she withdrew the letter from the envelope, for reading another's mail was going rather far, even for Mary V in her ruthless quest of clues.

But it was not a personal letter, which of course made a difference.