"And yet motive isn't everything," said Lawrence, with a grim smile; "for if Janet had a motive, as you say, an equal one must be attributed to me, as I am an equal inheritor of Uncle Robert's fortune."
I looked wonderingly at the young man. "The motive attributed to Miss Pembroke," I said "would probably not be her desire for inheritance, so much as the desperate difficulties attending her life with her uncle."
This seemed to surprise Lawrence, but he only said carelessly: "It doesn't matter what motive they assign to Janet, for she didn't have any motive, and she didn't do the deed. But, for the moment, I'm speaking not of facts or even possibilities, but of contingencies which might arise. It might be claimed that I had a motive, from the mere fact that I am one of my uncle's heirs."
"But you couldn't get in, George," said Janet quickly. "Your latch-key was of no use when the chain was on."
"That's true enough, Janet, and we all know it; but, as I say, we're speaking of a hypothetical case. And you know, if we're going to hunt for some other person with a motive, we're bound to admit that he got into the apartment somehow. Therefore, to eliminate the possibility of being myself a suspect, I'll merely state, as a matter of fact, that my alibi is perfect. I can prove, should it be necessary, that I was far away from Sixty-second Street at the time of Uncle Robert's death, and can account for my time all through the night."
I liked Lawrence's way of putting these things, and began to think his clear-headed views on the matter would be of assistance to me, even though he had no taste or talent for detective work.
"Just what is an alibi?" asked Janet, with a perplexed air.
"It means," I answered, "proof by witnesses of a person's whereabouts at a given time."
"Oh!" said Janet. "And where were you last night, George?"