Cate Granger and Jack Monroe are enjoying life far away from the deep-sea horrors of their past...but the ghosts still haunt them.

Russian billionaire and former friend Sonya Borashev tells them of a newly discovered cave in Antarctica that leads deep beneath the frozen continent. It's from these icy depths that Sonya believes a remnant species of megalodon shark has been set loose and that these ancient monsters are not only alive but thriving.

With a recent spate of horrifying attacks, Sonya leads an expedition to put an end to the monsters for good. And she wants Cate and Jack with her – whether they like it or not.

But beneath the dark ice, they uncover things even deadlier, even more dangerous than they could have ever imagined
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