andom, nor was the world to which it
reached an unknown one to Tommy or to Denham. Months before, Denham
had built an instrument which would bend a ray of light into the Fifth
Dimension and had found that he could fix a telescope to the device
and look into a new and wholly strange cosmos.[1] He had seen
tree-fern jungles and a monstrous red sun, and all the flora and fauna
of a planet in the carboniferous period of development. More, by the
accident of its placing he had seen the towers and the pinnacles of a
city whose walls and towers seemed plated with gold.

[1] "The Fifth-Dimension Catapult"--see the January, 1931,
issue of Astounding Stories.

Having gone so far, he had devised a catapult which literally flung
objects to the surface of that incredible world. Insects, birds, and
at last a cat had made the journey unharmed, and he had built a steel
globe in which to attempt the journey in person. His daughter Evelyn
had demanded to accompany him, and he believed it safe. The trip had
been made in security, but return was another matter. A laboratory
assistant, Von Holtz, had sent them into the Fifth Dimension, only to
betray them. One King Jacaro, lord of Chicago racketeers, was
convinced by him of the existence of the golden city of that other
world, and that it was full of delectable loot. He offered a bribe
past envy for the secret of Denham's apparatus. And Von Holtz had
removed the apparatus for Denham's return before working the catapult
to send him on his strange journey. He wanted to be free to sell full
privileges of rapine and murder to Jacaro.

The result was unexpected. Von Holtz could not unravel the secret of
the catapult he himself had operated. He could not sell the secret for
which he had committed a crime. In desperation he called in Tommy
Reames--rather more than an amateur in mathematical physics--showed
him Evelyn and her father marooned in a tree-fern jungle, and
hypocritically asked for aid.

Tommy's enthusiastic efforts soon became more than merely
enthusiastic. The men of the Golden City remained invisible, but there
were strange, half-mad outlaws of the jungles who hated the city.
Tommy Reames had watched helplessly as they hunted for the occupants
of the steel globe. He had worked frenziedly to achieve a rescue. In
the course of his labor he discovered the treachery of Von Holtz as
well as the secret of the catapult, and with the aid of Smithers--who
had helped to build t