Author: Robert A. Heinlein
Publisher: Ballantine 26069
Year: 1977 Print: 1 Cover Price: $1.75
Condition: Near Fine. Not read
Genre: Science Fiction
Pages: 189
Cover art by 
70120087E

Jim Marlow and his strange-looking Martian friend Willis were allowed to travel only so far. But one day Willis unwittingly tuned into a treacherous plot that threatened all the colonists on Mars, and it set Jim off on a terrfying adventure that could save--or destroy--them all!