Today, cyberwars have migrated from science fiction novels into reality. The US military views cyberspace as a fifth theater of war (along with land, sea, air and space), involving the Department of Defense, the NSA, the CIA, independent groups of hackers - all who can create and use computer viruses to strike the enemy. The famous American journalist Shane Harris describes in detail the history of the creation of the US military-network complex and the current trends in its development. We learn about the decisive role of cyber warfare in the Iraq war, about the collaboration of government agencies with such network giants as Facebook and Google in order to collect information about users. The author calls for a closer look at the partnership between technology and financial companies to patrol cyberspace and, finally, explains the dangers we all face when spending a lot of time on the Internet.