Christopher Quarles: College Professor and Master Detective

"Christopher Quarles," I said, reading from the bit of pasteboard. "My name. What is yours?" "Murray Wigan," I answered, and the next instant was wondering why I had told him. "Ah, I do not fancy we have met before, Detective Wigan. Perhaps we may help each other." "You knew Mr. Ratcliffe?" I asked. "No, but I have heard of him." "I am afraid that--" He laid two fingers of a lean hand on my arm.