A door is broken down, a dead body is found behind it; there is no other exit from the room, but equally no sign of a weapon nor any evidence of suicide…these classic staples of the archetypal impossible murder are put on page one of Miles Burton’s Death Leaves No Card. Added to this is the puzzle of precisely how the deceased came to decease, as there is sign of neither violence nor harm on the body, no evidence of poison or gassing, and, this being the late 1930s, the house is not yet fitted with electricity so it can’t have been electrocution. It may or may not be a locked room, since the window might or might not have been open, but the unclear nature of the death definitely makes it an impossible crime in my eyes. Either way, cue sensible Inspector Henry Arnold.