(13) Why did Richard Trenton come to New York and then commit suicide?

(14) What is the relation between Mr. Cunningham and the murdered man?

(15) Which one of those having a sufficient motive for killing Darwin answers to the following description: clever, unprincipled, and absolutely cold-blooded?

"Find the answers to those questions!" I repeated when I had devoured the sheet with my eyes. "It would take me a lifetime! For mercy's sake, don't fail me now when I have only you to depend on to help me!" I cried.

With an odd smile he took his pipe from his mouth and tapped the bowl upon his open palm. Then he looked at me and spoke abruptly, "If I take this case it will be on one condition."

"A thousand if you wish," I exclaimed impatiently.

"No, only one, that when I give commands they shall be obeyed implicitly, even though you may not be able to perceive their wisdom at the time."

I blinked at the unexpectedness of the answer and then held out my hand. "It shall be as you say, Mr. McKelvie, only don't let them convict Ruth."

He clasped my hand. "I won't, Mr. Davies, if she is guiltless, and my first command is this: I want an interview with Mrs. Darwin this afternoon."