It will avoid disagreeable explanations.

It is best to let them think we have never met." They were gone.

Kate sat petrified.

What understanding was this between Doctor Danton and their pale little seamstress?
They knew each other, and there were reasons why that acquaintance should be a secret.

"It would involve disagreeable explanations!" What could Doctor Frank mean?
The solution of the riddle that had puzzled Eeny came to her.