The Witling

A planet populated by a race of nearly-human aliens who have the ability to teleport with their minds. This ability varies from person to person: those without the talent at all are called witlings and are the lowest class of person in the planet's primitive societies. Two human explorers from a nearby colonized world become trapped on the planet, and struggle to find help from various powerful factions that wish to exploit the relatively advanced technology the humans brought with them.