If that scene meant anything, it meant, at least, that they had met before.

That there had been no time for explanations Sally could see, for their manner was still one of suppressed amazement at each other's presence there.

Darton's eyes, too, fell continually on the gown worn by Helena as if this were an added riddle to his perplexity; though to Sally it was the one feature in the case which was no mystery.

He seemed to feel that fate had impishly changed his vis-a-vis in the lover's jig he was about to foot; that while the gown had been expected to enclose a Sally, a Helena's face looked out from the bodice; that some long-lost hand met his own from the sleeves.
Sally could see that whatever Helena might know of Darton, she knew nothing of how the dress entered into his embarrassment.

And at moments the young girl would have persuaded herself that Darton's looks at her sister-in-law were entirely the fruit of the clothes query.