To poison her with bacilli which _I_ detected.

I cannot trust your word; I cannot trust your inferences.
Either she is not Yorke-Bannerman's daughter at all, or else...
Yorke-Bannerman was NOT a murderer...." I watched his face closely.
Conviction leaped upon me.

"And someone else was," I went on.

"I might put a name to him." With a stern white face, he rose and opened the door.

He pointed to it slowly.