A Person Changes Skin

In 1934, four brilliant Cambridge students are recruited to spy for Russia. Fueled by youthful idealism, a passion for social justice and a talent for lying, they take huge personal risks to pass Britain's biggest secrets to Moscow.

A security consultant hunts for a ruthless assassin. Equally obsessed with each other, they go head to head in an epic game of cat-and-mouse.

The spy game is a serious business, and throughout history, the tools and technologies developed for it have mattered as much as the spies themselves.