Motive

Detective John Cardinal attempts to uncover the mystery of what happened to the missing 13-year-old girl whose body is discovered in the shaft-head of an abandoned mine. At the same time, he comes under investigation by his new partner, Lise Delorme, a tough investigator in her own right.

A detective team apply new techniques to old crimes as they solve cold cases.

Deputy Police Chief Brenda Leigh Johnson transfers from Atlanta to LA to head up a special unit of the LAPD that handles sensitive, high-profile murder cases. Johnson's quirky personality and hard-nosed approach often rubs her colleagues the wrong way, but her reputation as one of the world's best interrogator eventually wins over even her toughest critics.

Follow the investigations of a team of NYPD forensic scientists and police officers identified as "Crime Scene Investigators".