"What do you make of it?" inquired Tierney.
"Let's go up again," suggested Morgan, without replying to the question.
Back in the living room, the men resumed their seats, and spoke in lowered voices.
"It's hard to tell what it means," Morgan at last replied. "That's the first time anything of the kind ever happened to me."
"How did you get wise?" asked Tierney.
"I heard the door move several times," Morgan explained. "At first I thought it was the wind, but the last time I heard it I was sure it had a different sound. It seemed to me that somebody had leaned against the door while trying to listen."
"By God!" exclaimed Tierney. "This is SOME case, Morgan. Are we spying on somebody, or is somebody spying on us? Marsh trails a girl; I chase up Marsh; and now I'm damned if I don't think somebody's chasing me, too."
"It begins to look like a bigger case than I thought, Tierney. An ordinary murderer usually gets out of town or lays low. Quite likely somebody is afraid we will unearth more than a murder. You run along now. I want to be alone to think things over. On your way home stop off and look up Murphy. Find out whether or not Marsh has left the house tonight. Telephone me what you find out."
"Sure thing," answered Tierney, and picking up his hat, hurried away.
Morgan sat down in his chair and began to refill his pipe. After lighting it, he settled back into his chair and meditated on the case. Reviewing in his mind the various bits of fact, information and incident which he now had at hand, he endeavored to separate or combine them according to their direct bearing upon the case.