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With the island of Avalon far behind them, Meredith and her companions continue their search for Candidate One in the hope of finally discovering the secrets behind why they were brought to this strange, future-version of Earth. Wild adventures, mysterious technologies, and new friends will help Meredith on her journey. But the Adversary has its own plans for her, and soon she finds herself fighting for survival against an enemy unlike anything she has encountered before. There is only one hope for the future of humanity. Can Meredith handle the burden?

While training for a manned mission to Mars, Dr. Sophie Winston and her team of scientists find themselves cut off from the rest of the world. Trapped inside a biosphere deep within the confines of Cheyenne Mountain, Sophie and crew discover they are the survivors of a brutal alien invasion. But as they struggle to stay alive, they realize their safe haven is far from safe and that they must team with other survivors around the world to defeat the aliens before it's too late for humanity, and the Earth.

In the early days of the Civil War, rumors of gold in the frozen Klondike brought hordes of newcomers to the Pacific Northwest. Anxious to compete, Russian prospectors commissioned inventor Leviticus Blue to create a great machine that could mine through Alaska’s ice. Thus was Dr. Blue’s Incredible Bone-Shaking Drill Engine born.