It's the summer of 2014. A hacker from the Dutch intelligence agency AIVD has penetrated the computer network of a university building next to the Red Square in Moscow... One year later, from the AIVD headquarters in Zoetermeer, he and his colleagues witness Russian hackers launching an attack on the Democratic Party in the United States. The AIVD hackers had not infiltrated just any building; they were in the computer network of the infamous Russian hacker group Cozy Bear. And unbeknownst to the Russians, they could see everything...

That's how the AIVD becomes witness to the Russian hackers harassing and penetrating the leaders of the Democratic Party, transferring thousands of emails and documents. It won't be the last time they alert their American counterparts...

The Cozy Bear hackers are in a space in a university building near the Red Square. The group's composition varies, usually about ten people are active. The entrance is in a curved hallway. A security camera records who enters and who exits the room. The AIVD hackers manage to gain access to that camera. Not only can the intelligence service now see what the Russians are doing, they can also see who's doing it. Pictures are taken of every visitor...

The Dutch access to the Russian hackers' network soon pays off. In November, the Russians prepare for an attack on one of their prime targets: the American State Department. By now, they've obtained e-mail addresses and the login credentials of several civil servants. They manage to enter the non-classified part of the computer network.

The AIVD and her military counterpart MIVD inform the NSA-liaison at the American embassy in The Hague. He immediately alerts the different American intelligence services.

What follows is a rare battle between the attackers, who are attempting to further infiltrate the State Department, and its defenders, FBI and NSA teams - with clues and intelligence provided by the Dutch.