Giant rockets that probe the borders of space provide authentic scientific background for this breath-taking Rick Brant adventure. When Rick, son of a famous scientist, and his pal Scotty go to work at a secret rocket base in Nevada, only two men at the base know their real mission: to track down the saboteur who calls himself "The Earthman."

Thrills and perils during a rocket firing, in an abandoned desert mining town at a radar-tracking station, and in the instrument chamber of a great rocket lead to the solution of The Scarlet Lake Mystery.

How Rick uncovers the terrifying threat to Project Pegasus, and how this discovery culminates in an unexpected adventure that nearly costs Rick his life when he ventures into dangers no man has ever faced, will keep the reader spellbound to the very last page of this gripping story!