Page:Murder of Roger Ackroyd - 1926.djvu/107

 Who opened it? Clearly only Mr. Ackroyd himself could have done so, and for one of two reasons. Either because the room became unbearably hot (but since the fire was nearly out and there was a sharp drop in temperature last night, that cannot be the reason), or because he admitted some one that way. And if he admitted some one that way, it must have been some one well known to him, since he had previously shown himself uneasy on the subject of that same window."

"It sounds very simple," I said.

"Everything is simple, if you arrange the facts methodically. We are concerned now with the personality of the person who was with him at nine-thirty last night. Everything goes to show that that was the individual admitted by the window, and though Mr. Ackroyd was seen alive later by Miss Flora, we cannot approach a solution of the mystery until we know who that visitor was. The window may have been left open after his departure and so afforded entrance to the murderer, or the same person may have returned a second time. Ah! here is the colonel who returns."

Colonel Melrose entered with an animated manner.

"That telephone call has been traced at last," he said. "It did not come from here. It was put through to Dr. Sheppard at 10.15 last night from a public call office at King's Abbot station. And at 10.23 the night mail leaves for Liverpool."