After Larry's many days and nights of futile searching of his brain for a plan that would accord with his fundamental idea for awakening the unguessed other self of Maggie, the plan, which finally came to him complete in all its details in a single moment, was so simple and obvious that he marveled it could have been plainly before his eyes all this while without his ever seeing it.

Of course the plan was dangerous and of doubtful issue.

It had to be so, because it involved the reactions of strong-tempered persons as yet unacquainted who would have no foreknowledge of the design behind their new relationship; and because its success or failure, which might also mean his own complete failure, the complete loss of all he had thus far gained, depended largely upon the twist of events which he could not foresee and therefore could not guide.
Briefly, his plan was so to manage as to have Maggie received in the Sherwood household as a guest, to have her receive the frank, unquestioning hospitality (and perhaps friendship) of such a gracious, highly placed, unpretentious woman as Miss Sherwood, so distinctly a native of, and not an immigrant to, the great world.

To be received as a friend by those against whom she plotted, to have the generous, unsuspecting friendship of Miss Sherwood--if anything just then had a chance to open the blinded Maggie's eyes to the evil and error of what she was engaged upon, if anything had a chance to appeal to the finer things he believed to exist unrecognized or suppressed in Maggie, this was that thing.
And best part of this plan, its effect would be only within Maggie's self.

No one need know that anything had happened.