The main character, Cas, is the first human child ever born on Mars. Martian kids are living what is, to them, ordinary lives in their underground colony, but for the first time they will be allowed to see and explore the surface of their homeworld. The details of the habitat, its life-support systems, and surface suits are rooted in realistic science and technology, with further details explained in a postscript to the book. Future books of the series will address fundamental issues of survival on Mars: air, shelter, water, food, etc.
