"Now your idea is that Miss Prentice, having in some way managed to secure a car, returned to Geralton that evening and got into the castle through the library window?"
"No, I doubt if she entered the castle. I can think of no reason why she should have done so," said Cyril.
"In that case, how do you account for her injuries? Who could have flogged her except your charming cousin?"
"I hadn't thought of that!" exclaimed Cyril.
"Granting that she is Priscilla Prentice, the only hypothesis I can think of which explains her predicament is this: Having planned to rescue her mistress, she was only waiting for a favourable opportunity to present itself. The doctor's visit determined her to act at once. I agree with you that to re-enter Geralton was not her original intention, but while waiting under the library window for Lady Wilmersley to join her, she hears Wilmersley ill-treating his wife, so she climbs in and rushes to the latter's assistance."
"Yes, yes," assented Cyril with shining eyes.
"But she is overpowered by Wilmersley," continued Campbell, warming to his theme, "who, insane with rage, flogs her unmercifully. Then Lady Wilmersley, fearing the girl will be killed, seizes the pistol, which is lying on the desk, and fires at her husband----"
"I am convinced that that is just what happened," cried Cyril.
"Don't be too sure of it; still, it seems to me that that theory hangs together pretty well," Campbell complacently agreed. "Of course, neither woman contemplated murder. Wilmersley's death completely unnerved them. If the gardener's wife heard a cry coming from the car, it is possible that one or the other had an attack of hysterics. Now about the jewels--I believe Miss Prentice took charge of them, either because Lady Wilmersley was unfit to assume such a responsibility or because they agreed that she could the more easily dispose of them. I think that Miss Prentice's hurried trip to town was undertaken not in order to avoid arrest, but primarily to raise money, of which they must have had great need, and possibly also to rejoin her mistress, who, now that we know that she made her escape in a car, is probably hiding somewhere either in London itself or in its vicinity."