The scientists of Spindrift Island are developing a device that can pick up the electrical impulses of the human brain, a million-dollar gimmick that rival powers would dearly like to steal. Teenage Rick Brant and his ex-Marine friend Don Scott find their island invaded by outsiders and security men, and set out to unmask a spy hidden within the project.
Solid 1950s science-adventure from a series much loved by young readers of the period. Download the free EPUB.