Katherine's secret had in reality been news to her; she had not paid enough attention to the Medcrofts to notice anything that they did, so long as they did not do it in conjunction with the Odell-Carneys.

The Odell-Carneys were her horizon,--morning, noon, and night.

And now there was likelihood of that glorious horizon being obscured by a sickening scandal in the vulgar foreground.

Inspired by Katherine's dreadful conclusions, the excellent lady set about to observe for herself.

During the entire evening she flitted about the hotel and grounds with all the snooping instincts of a Sherlock Holmes.
She lurked, if that is not putting it too theatrically.