What Happened to Hammond?

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How could a dead body travel sixty miles almost instantaneously through a bitter winter's night? Chief Inspector Garth could deal with three-dimensional problems, but Hammond's inexplicable transition was beyond him. Garth called in Dr. Carruthers to see if the eminent physicist could explain the mystery. The Doctor could! But not until a further baffling murder had been committed could Carruthers demonstrate - by means of a strangely airborne teapot - exactly what happened to Hammond.