During the year 2125, former asteroid miners Max Cody and Elaine Zhou never get a moment's rest. No sooner have they doused the flames of war between Earth and Mars or returned from their first trip to the Tavern on the Edge of Time when they are called upon to help fit out the fledging Martian colony orbiting Jupiter's moon Callisto. In parallel, Earth extradites the war's fomenter, ex-billionaire arms merchant Xanthus Rex, hoping to gain from his insights into Martian teleportation technology, but he manages to turn Earth's resources toward private revenge against Max, Mars, and the Callisto Colony. In the meantime aliens are leaking into the Earth-Mars continuum from the Tavern, whose proprietor repaired and upgraded Max after accidentally injuring him during an asteroid mining expedition. Max's enhancements help, of course, but when strange beings with the power to animate matter-the Assemblers-find their way to Earth, Max, Mars, and humanity are sorely beset. Worse yet, the Tavern itself is becoming unstable, its acquisitive host having overstretched his considerable powers. His prospecting for collapsed neutron matter has also opened portals between continua, inadvertently adding still more aliens to the mix. That's when the Assemblers' overlord arrives and Max finally meets his match. Oh, and Elaine is expecting their hybrid baby. Yes, you might say these are difficult times at the Tavern on the Edge of Time.