sill

He opened the window and made the mark on the sill to give an idea of how the murderer escaped.

“And look at this!” He held the lamp down and illuminated a smudge of blood like the mark of a boot-sole upon the wooden sill.

“The open window, the blood on the sill, the queer card, the marks of boots in the corner, the gun!”

Do you tell me that in that time the guilty person managed to make footmarks in the corner, open the window, mark the sill with blood, take the wedding ring off the dead man’s finger, and all the rest of it?