Marine archaeologists Kate Wetherall and Lou Bates are diving a shipwreck near Howland Island - a remote dot in the vast Pacific Ocean - when a deep-sea explosion unearths the remains of a plane on the ocean floor. It is a plane last seen in 1937 - with Amelia Earhart at the controls. When Kate and Lou find a mysterious, corroded metal cylinder hidden in its cockpit, they know instinctively that they have come across something rare and valuable.

They share their discovery with US Naval Commander Jerry Derham and MI6 Agent Adam Fleming, and are shown an extraordinary piece of footage. It shows Albert Einstein discussing a top-secret defence technology he had been working on with the US military, before encoded data vital to his work was lost - along with the cipher secretly sent across the globe on Earhart's fateful flight.

As shady energy conglomerates and global superpowers begin to circle, Kate and Lou must track the lost code's trail through Nazi Germany and Soviet Russia to modern-day Moscow and beyond.

There is no time to lose. Whoever cracks the code could hold the key to global power . . .