I had a perfect firing position, with the rifle positioned on a wood and metal stand erected against the broad windowsill. All the equipment had been painted a dull black and laid out on the bed like sinister evening clothes, with the black velvet hood stitched to a shirt, made from the same material. The hood had wide slits for the eyes and mouth, reminding me of pictures I had seen of the executioner of Anne Boleyn. Switching off the attic lights, I took off my coat, put a stick of chewing gum into my mouth and donned the hood. I lay along the bed and got my eye to the rubberised eyepiece of the telescopic sight, and gently lifted the curtain over my shoulders. The grounds of the house were like a well-worn photograph. I scanned it all slowly, moving the 'scope with the rifle, adjusti

