Northern Irish police detective Tom Brannick connects a suicide note with an infamous cold case with enormous personal significance. 20 years on, a cold case awakens with an assassin on the loose—and chilling connections to DCI Brannick's own past.

A drama set in the East End of London in 1889, during the aftermath of the "Ripper" murders. The action centres around the notorious H Division – the police precinct from hell – which is charged with keeping order in the chaotic streets of Whitechapel. Ripper Street explores the lives of characters trying to recover from the Ripper's legacy, from crimes that have not only irretrievably altered their lives, but the very fabric of their city. At the drama's heart our detectives try to bring a little light into the dark world they inhabit.