It's been more than two years since Denver Moon discovered that alien shape-shifters infiltrated Mars Colony. Their attempts at human mind-control have failed, but when Denver opens a vault beneath a terrafarming facility, she discovers what they really want: to exterminate all inhabitants of the Red Planet. Tatsuo Moon - Denver's Grandfather and the co-founder of Mars City - has been gravely injured. To save him, Denver will need the help not o nly of her friends, Smith, Nigel and Navya, but also humanity's archenemy, Doctor Werner. To save Mars, she'll need a miracle.
