Rose reprises her role as PC Farida Jatri, whom we first met in series 4 working out of Polk Avenue Station under the command of DCI Roz Huntley (who is now in prison). PC Jatri is now working at MIT under DCI Joanne Davidson, whom she not only reported to DS Arnott at AC-12 about her suspect behaviour during the Vella murder investigation, but also had a secret relationship with that appears to have ended (badly) right before series 6 begins.
Image Source: BBC Pictures