Lopez plays Harlee Santos, a detective for the New York Police Department who secretly works in the FBI's anti-corruption task force. A single mother, she also copes with various personal and financial complications.
Co-starring with Lopez is Ray Liotta, who plays Harlee's boss and mentor Matt Wozniak. The duo's characters, for whom "morally ambiguous" would be a euphemism, accept bribes and other offers from criminals to support New York's expensive lifestyle.
The series also features Warren Kole, Drea de Matteo, Dayo Okeniyi, Vincent Laresca, Hampton Fluker, Sarah Jeffery and Gino Anthony Pesi.
During its first season, the show averaged a 2.3 rating in the 18-49 demographic. With DVR playback factored in, Shades of Blue averaged 9.9 million viewers.