Tempo Books (#T 28) 1st printing March 1963 paperback (hardcover was in 1955.) Cover by ???, 191 pages, 50 cent cover price. Condition is Fine (-): very tight and square with flat spine; age tanning is mild and uniform - rather nice for its vintage. Barest trace of overall rubbing. No stamps, marks or writing - a clean copy that looks unread.

The Secret of the Martian Moons - By 2120, Earth had established a colony on Mars, and explored the land originally inhabited by the now-vanished Martians. Returning to Mars after being educated on Earth, Nelson Parr discovers a 3-fingered handprint in his cabin - a Martian? The inhabitants of Mars were ordered to return to Earth, but Nelse, his father, and 4 other scientists disobeyed. They set up observation posts on Phobos and Diemos - unaware that they, too, were being observed!