A machine, Psychomech, granted Richard Garrison great and terrible mental powers - strength enough to restore his dead love and vanquish his enemies.

Through Psychomech, too, Garrison learned of the Psychosphere, another plane where mental powers ruled supreme - and where Garrison was sole tenant.

Now a new mind has entered the Psychosphere, a mind twisted and evil and bent on controlling the Earth. Richard Garrison must discover the owner of that mind - and destroy it!