It is a freezing December night and Christmas shoppers have gathered to listen to a Salvation Army carol concert. Then a shot rings out and one of the singers falls to the floor, dead. Detective Harry Hole and his team are called in to investigate but have little to work with--there is no immediate suspect, no weapon and no motive. But when the assassin discovers he's shot the wrong man, Harry finds his troubles have only just begun.

Nearly 800 years ago, a man name Sung Tz'u wrote a book detailing forensic methods. Today, forensic tools such as fingerprinting and DNA testing are used to solve crimes around the world. Find out more in Forensics, one of the titles in The Hidden World of Crime series.

The very first police in what is now the United States were Native American warriors who kept order during hunts. Today, American law enforcement includes the Texas Rangers, Secret Service, and U.S. Marshals Service, among many others. Find out more in Law Enforcement, one of the titles in The Hidden World of Crime series. T