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Also, casting news has been announced. David Threlfall will be joining the fourth series of Ripper Street as will Jonas Armstrong.
They join returning cast members Matthew MacFadyen, Jerome Flynn, Adam Rothenberg, Charlene McKenna and MyAnna Buring will also be back.
Lucy Cohu (Deborah Goren) and Derek Riddell (Constantine) will also return, reprising their roles from the very first series of Ripper Street.