Mars Endeavour Books in Order

An international colony of scientists and astronauts lives beneath the surface of Mars, protected from the planet's radiation. When catastrophe strikes Earth, the settlers must confront a crisis their preparations never anticipated and reconsider whom they can trust.

After surviving disaster on Mars, astronaut Liz Mathieson returns to an Earth unsettled by war and insurgency. She carries remnants of the artificial intelligence responsible for the conflict, uncertain whether it also preserves something of her dead partner.