Monsters are real. 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...