The Tomorrow People
Judith Merril
 Only one man, Johnny Wendt, has returned from the first expedition to Mars. Efforts to determine what happened to the others are in vain; four pages of the ship's log are missing, and Johnny's companion, Doug Laughlin, apparently wandered off to die in the desert. Johnny's girlfriend, Lisa Trovi, and a psychiatrist named Phil Kutler try to cure Johnny by luring him to the Moon and getting him to grapple with whatever happened on Mars. Johnny reacts so badly that they return to Earth as quickly as possible.