Undercover cops have been called the 'guerilla soldiers' in the war against crime, assuming the identity of criminals or victims to enter a shadowy world where one false move can cost them their lives. Whether the crime is prostitution, drugs, armed robbery or murder-for-hire, the undercover cop must become a consummate actor to gather crucial evidence. Their weapons: hidden video cameras and body wires, and a backup team that is often the only thing that can save them when things go wrong.