"Some say the world will end in fire, some say in ice." Thus Robert Frost warns President Kennedy about the Shadow, before departing on a classified mission on the first nuclear submarine, the USS Nautilus. Past and present collide in this thriller.

In the present, on the Nazca Plain in Chile, an old woman has been studying ancient lines in the ground for decades. Now she finally understands their terrifying message.

In 480 BC, King Leonidas leads 300 Spartans to Thermopylae to try to delay the massive Persian Army. Known only to the King, they have an even more important mission: to escort and protect a powerful priestess to a mystical gate through which she can travel to help save the world. It's a mission for which Leonidas will gladly sacrifice his own, and his men's lives.

In the present, tremors deep inside the Earth threaten the world. Eric Dane races against time to find the key to stopping this assault from the dark Shadow. He must reach across time to the Spartans and the priestess they escort to find the key to this defense.

And in doing so, he must travel to the Space Between, the boundary between our world, and the world of the Shadow.

#1 Bestselling series in both the U.S. and U.K. Over 1 million sold.

#1 New York Times Bestselling Author Terry Brooks: "Spellbinding!"

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• Science Fiction & Fantasy

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