Crime in the Village - Agatha Christie

The colonel was dead.

There was no doubt about it. There he was lying down with his arms stretched out on the desk in an unnatural, terrifying position. I gathered myself and turned to him. The cold hand you raised fell lifeless!

The problem is that I was saying - only hours earlier - that anyone who kills Colonel Prothero will be doing the world a great service.

Someone did it...in my office!