The invisible master

By EDMOND HAMILTON
Author of The Hidden World, Cities in the Air, etc.
Illustrated By RUGER
A thousand alarms are pouring into Police Headquarters! The Invisible Master broods over the city! Who is He? We defy any reader to guess the secret! Even the editorial staff of SCIENTIFIC DETECTIVE MONTHLY was astounded at the conclusion of this scientific yarn. Write and tell us if you were able to foretell the ending.
If you were to ask us which, in our opinion, is the greatest scientific detective story of the year, we certainly would pronounce the present story to be that unusual gem.
Here is a story that will keep you fascinated, not only in connection with its excellence of science, understandable by everyone, but by the fast-moving action for which this well-known author is famous.
Invisibility in this sort of story is perhaps not a new idea; but we venture to say that no one can foretell the O. Henry-like ending, which is as unexpected as it is dramatic.
CHAPTER I
Carton Earns His Salary
And to think, Charlie Carton exclaimed, that they pay you a city editor's salary for ideas like that!
The other looked up from his desk, nettled. I didn't say I took any stock in the thing, Carton, he pointed out. But I got the tip that the Courier and the Sphere have their men hurrying out to the university, and we can't afford to miss anything.
And I'm to write a breath-holding tale of how Dr. Howard Grantham, the super-physicist, has discovered the secret of invisibility? demanded Carton.