In this masterpiece of fear and suspense, Rufus King tackles the dangerous subjects of love and atomic energy. The resulting romantic riddle is a brain-teaser guaranteed to stymie detective fans until the very last page.

Ramier Bellamy kisses Drusilla Duveen good-bye and prepares to make himself invisible. But something goes wrong with his experiment—and when the machine he invented started to hum, it is Drusilla, not he, who vanishes!

That's just the first in a series of mysterious events that will keep you guessing—and wondering!