This you must realise." XXI CARMEL AWAKES One woe doth tread upon another's heel, So fast they follow.
_Hamlet_.
Later, I asked myself many questions, and wandered into mazes of speculation which only puzzled me and led nowhere.

I remembered the bottles; I remembered the ring.

I went back, in fancy, to the hour of my own entrance into the club-house, and, recalling each circumstance, endeavoured to fit the facts of Arthur's story with those of my own experience.
Was he in the building when I first stepped into it?
It was just possible.

I had been led to prevaricate as to the moment I entered the lower gateway, and he may have done the same as to the hour he left by the upper hall window.

Whatever his denials on this or any subject, I was convinced that he knew, as well as I, that Carmel had been in the building with her sister, and was involved more or less personally in the crime committed there.