police officer derisively. "You can't clear her by dragging into this business some third person who never existed. For there were no marks, and marks would have been left by anybody who came to the window!"
"Marks!" Trant echoed. "If you mean marks on the window-sill and floor, I cannot show you any. But the murderer did leave, of course, one mark which in the end will probably prove final, even to you, Siler. The shell of the fifth shot is missing because he carried it away in his revolver. But the bullet—it will be a most remarkable coincidence, Siler, if you find that the bullet which killed young Newberry was the same as the four we know were shot from his wife's little automatic revolver!"
"But the ice—the ice under the window!" shouted the detective. "You saw for yourself how her heels and ours cut through the crust; and you saw that there were no other heel marks, as there must have been if anyone had stood outside the window to look through it, or to fire through it, as you say!"
"When you have reached the point, Siler," said Trant, more quietly, "where you can think of some class of men who would have left no heel marks but who could have produced the effect on young Newberry's mind which his wife has described, you will have gone far toward the discovery of the real murderer of Walter Newberry. In the meantime, I have clews enough; and I hope to find help, which cannot be given me by the city police, to enable me to bring the murderer to justice. I will ask you, Mrs. Newberry," he glanced toward the girl, "to let me have
