“But are you sure you left it shut?” interrupted the Superintendent.
“Quite sure, sir, shut and locked, and I had the key in my pocket with me. Then, seeing the seals were still on the safe, I ran out of here and up the passage, to find the back door was open. I rushed outside and flashed my torch, but it was pitch dark, and I could not see anyone. Then I came and examined the whole place thoroughly. Look at the desk there. They first tried to tamper with the lock, and then they used something like a screwdriver to prize the roll-top up. See where they put in the wedge.”
Everyone bent over the desk, and Stone exclaimed scornfully, “The fool! He tried to lift it up from the middle, whereas if he'd put in the screwdriver or whatever it was at one of the ends the leverage would have been mu
