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S4 E3: When a pregnant junior doctor is found beaten to death in the carpark of the hospital where she works, the prime suspect becomes her boyfriend, Joe Nash (Matthew McNulty), who cannot provide a solid alibi for where he was at the time of the killing. Mobile phone traces put him in the right place at approximately the right time but when his therapist (Nicola Walker) provides him with an alibi for that evening, Matt and Ronnie begin to suspect they are having an affair. On arrest, a more harrowing truth emerges. What initially seems like a crime of passion soon unravels into a conspiracy involving senior level government officials. Risking their careers and defying the instruction of the Director of Public Prosecutions, James and Alesha must get to the bottom of this case before another life is destroyed.