A new force has awakened in the galaxy.
Thalia has defeated the Justines, the Krepyons, and the Sisterhood. After claiming his Earth son Lorenz, the Maca of Don returns to Earth for a family reunion. But the planet has changed: it's the 1970's, and one of their family members is trying to dismantle their business and take it public. Another has killed four men, and the doctors are beginning to suspect that there's something strange about the MacDonald family.
Meanwhile, the newer members of the MacDonald and Rolfe clans are unaware of their alien heritage and abilities, and General MacDonald is carrying a heavy secret of other alien beings. The Maca of Don and Lorenz soon learn that there is a new presence in the galaxy - one bent on conquest and destruction.
Thalia and Earth is the fifth book in Mari Collier's science fiction saga, Chronicles of the Maca.