 Lt. John Barton is sent on a special mission to deliver a special vaccine to a distant mining colony. He is infuriated to find Lee, a stowaway aboard his spacecraft. Barton has only enough fuel to carry himself and his precious cargo, and Lee s added weight insures that they will crash if she stays on board. They have gone too far to turn back, and Barton s superiors make it clear: the mission takes precedence and Lee has to be dumped into space. But she won t go quietly.