Bergmann's Comet, Bk 3, builds on the two previous books: Batwing - Bergmann's Commitment, Bk 1, and Bergmann's Team, Bk 2, continuing the story of a trio of comets hurled out of the Oort Cloud threatening Earth's civilizations. Bergmann's small group assists Banderat and Striver vacuum grunts to divert the comets and minimize catastrophic terrestrial impact. Guy and Nita Bergmann join with a small group of ex-NASA astronauts to emplace crude drivers on the surface of Comet 1. The drives create a small lateral thrust redirecting the comet to just miss Earth. Two of the three comets are redirected to impact Mars: the first stage of a massive terraforming effort to prepare that second Human planet for a colony. Bergmann Ventures, Inc., Guy's space venture, prepares for a post-comet growth phase that will place Humans in space permanently so they may interact with the Concordat's Hub Planets and cultures. Bergmann's Equestrian Venture, Bk 4, relates the first phase of the post-comet expansion into space with the introduction of horses to the concordat planet Baldon. Bergmann's Orbitat, Bk 5, defines the construction of an orbital habitat at L5 allowing easy access to both the Lunar surface and Mars.