When thirteen year-old Beth Ryder and her widowed mother move to a new home by the sea, their lives are changed forever when they meet a friendly family of aliens from another galaxy. The family consists of twelve year-old bossy boots, Tilzi; her eleven year-old wimpy brother, Azbon; their huge alien dog, Raz; and their father, Vinrik. Beth eventually learns the amazing truth about her new friends, and her ordinary life becomes extraordinary when she and her mother are invited to live with the aliens on their magnificent starship called Galastra.

Temporarily parked in the outer reaches of the solar system, Galastra is so big that it's a world of its own, a magical world of starcars, house-ships, robots, holograms, and spaceships. Join Beth as she takes a journey to the stars, braves dangers, meets interesting aliens and robots, spacewalks, and discovers the wonders of Galastra.