Surely there is another alternative

Surely there is another alternative, Mr. Holmes. I don't know whether you observed my bedroom window?"

"Lattice-paned, lead framework, three separate windows, one swinging on hinge, and large enough to admit a man."

"Exactly. And it looks out on an angle of the courtyard so as to be partly invisible. The man might have effected his entrance there, left traces as he passed through the bedroom, and finally, finding the door open, have escaped that way."
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