Brainship #2: PartnerShip by Anne McCaffrey, Margaret Ball

Her name was Nancia Perez y de Gras. Like the other five young people aboard, she was an aristocrat… a member of one of the illustrious High Families. And, like the others, she was a new graduate, just starting out on her own career.

But while the rest were bound for less-than-glamorous assignments—for reasons they preferred to conceal—on planets in a remote sector of the galaxy, Nancia was already on duty and proud of it: as a brain-ship for the Courier Service.