The killer left a clue. I wonder if I disturbed a wild cat before it could eat the mouse* or whether it was a domestic cat from the nearby caravan park killing for fun. Whatever it was, it paused on the step long enough to melt the frost. Did it wait there to catch the mouse or stand there triumphant after it made the kill?
*I think it’s a cats paw prints and a mouse – let me know if I think wrong!