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What if you had the power to change the past? It's 1907, and Nellie Hartford has a rare ability: a lightning strike can send her jumping through time. When the thunder rolls, the question is should she jump back to prevent the childhood fever that led to her husband's premature death or forward to find a treatment for her baby's severe gastrointestinal issues? And what if saving one leaves her without the other? What if she loses them both? Dr. Jeff Marshall doesn't quite know what to do with the woman who accosted him in the hospital parking lot looking like she walked off stage.

It was just one year ago that she and her team of marine biologists had stunned the world with their incredible breakthrough. And now, they were about to do it again. But an ocean away, something strange was unfolding. Along a lonely coast in South America, an experimental Russian submarine, long thought to have been dismantled, has suddenly resurfaced. And the US Navy had taken notice, sending officers John Clay and Steve Caesare to investigate.

Deep in the Caribbean Sea, a nuclear submarine is forced to suddenly abort its mission under mysterious circumstances. Strange facts begin to emerge that lead naval investigator, John Clay, to a small group of marine biologists who are quietly on the verge of making history.