By New York Times best-selling author Bob Mayer writing as Robert Doherty (author of the best-selling Area 51 series)

"Some say the world will end in fire, some say in ice." Thus Robert Frost warns the President of the Shadow at the beginning of Atlantis Gate, before departing on a classified mission on the first nuclear submarine, the USS Nautilus.

A war beyond time. An enemy beyond space. A thriller beyond your wildest dreams. Three areas on the Earth's surface defy explanation: the Bermuda Triangle, the Devil's Sea of Japan, and a small region of Cambodia. Inside these realms, planes have disappeared, ships have vanished, and, in Cambodia, an entire civilization has been lost leaving behind Angkor Wat.

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.

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 the present, tremors deep inside the Earth threaten all civilizations. 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.