On the eve of a top secret space mission, Captain Calli Chase detects a tripped alarm in the tunnels deep below a NASA research center. A NASA pilot, quantum physicist, and cybercrime investigator, Calli knows that a looming blizzard and government shutdown could provide the perfect cover for sabotage, with deadly consequences. As it turns out, the danger is worse than she thought. A spatter of dried blood, a missing security badge, a suspicious suicide<U+2014>a series of disturbing clues point to Calli<U+2019>s twin sister, Carme, who<U+2019>s been MIA for days. Desperate to halt the countdown to disaster and to clear her sister<U+2019>s name, Captain Chase digs deep into her vast cyber security knowledge and her painful past, probing for answers to her twin<U+2019>s erratic conduct. As time is running out, she realizes that failure means catastrophe<U+2014>not just for the space program but for the safety of the whole nation.