Solution—A Revengeful Attempt

It was obviously a case of suicide. The door, with stuffing at the bottom on the inside, was locked on the outside. The windows, with cracks stuffed, were also locked. Therefore, no one could possibly have left the room. Duval, with an intense hatred for Olson, had locked the door on the outside, gone around and entered the study through a window, made his preparations, written the note hoping to incriminate his enemy, and killed himself.

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REVENGE IS SWEETER THAN LIFE ITSELF. SO THINK FOOLS.

—Juvenal