She only knew that--once again--Roger was hiding something from her--doing something secret and disgraceful--and she suddenly resolved to surprise and confront him.
With a mind still vaguely running on the legal aspects of what she meant to do, she had bade the nurse follow her.

The rest had been half spontaneous, half acting.

It had struck her imagination midway how the incident could be turned--and used.
She was triumphant; but from sheer excitement she wept and sobbed through the greater part of the night..