Parents need to know that this London-set crime drama includes graphic scenes of murder (for example, a woman is beaten and strangled by a man) and allusions to sex acts, though nudity is rare. Strong language includes cursing as well as frank discussion of violent sexual assaults (some of which involve minors), and there's plenty of plot-driven suspense in each investigation. The series raises intriguing questions about whether the need for public safety outweighs citizens' privacy rights. It's definitely not for kids, but adults and mature teens may enjoy the show's unique approach to fighting crime.

Families can talk about the legal and ethical challenges of law enforcement. What kinds of evidence must police officers compile against a criminal? How subjective is the American court system? How does it compare to the British system? Is it possible to be truly impartial as a juror or a judge? Why is crucial evidence sometimes omitted from a trial? How would our justice system be affected if police were allowed to bend the rules to build a case against a suspect? What would be the negative result of such a change? Could it be a good thing? How could the system be abused? How does this show compare to American crime dramas?