Facing a trail of murders staged as chilling word games, a rookie police captain and a goofy detective race to solve a serial killer's deadly puzzles.
There won't be a season 2, the show has ended.
A teenager is charged with lying about her rape allegation, but two determined investigative female detectives discover a far more sinister truth.
One victim, found dead on a London street. Four detectives, in four different time periods, must solve the mystery to protect Britain's future.