Who can tell that, should we learn the secret of her mystery, it would not precipitate a tragedy more terrible than that which had already been enacted here?
Who can tell if it might not mean her death?
Yet it had brought her close to death,--and we still knew nothing.

Or, rather, there are some of us who know nothing.

But I--if I knew who, I should know all.

Who ?--Who ?--Not knowing who, I must remain silent, out of pity for her.

For there is no doubt that she knows how he escaped from The Yellow Room, and yet she keeps the secret.