The Crystal Crypt

Stark terror ruled the Inner-Flight ship on that last Mars-Terra run. For the black-clad Leiters were on the prowl ... and the grim red planet was not far behind. In the distant future, when Earth and Mars are on the verge of war, the last Earthmen departing the red planet are held up by Martian soldiers searching for three saboteurs who destroyed an entire Martian city-an event that will quickly bring the precarious interplanetary conflict to a head.