Fear gripped the professor's heart as he looked towards the mummy-case -- and saw it empty!Marmion reels under the vision raised by a conundrum from Pythagoras . . . for the mathematical puzzle has given him a glimpse beyond his present reality -- beyond these three dimensions . . . and now something strange is happening, involving that mummy newly arrived from Egypt -- the one that looks so much like his lovely daughter, Nitocris!