The murder investigation takes Perez and Tosh to Glasgow as they try to uncover the reasons behind Maguire's brutal death and his connection to Robbie Morton. But old ghosts return to haunt Perez as his enemies try to prevent him from getting to the truth.
Quest roles:
Sara Vickers(Leanne Randall), CiarĂ¡n Hinds(Michael Maguire), Saskia Reeves(Freya Galdie), Archie Panjabi(Asha Israni), Jack Greenlees(Craig Cooper), Anna Chancellor(Phyllis Brennan), James Cosmo(Arthur McCall), Marnie Baxter(Jenny), Fletcher Mathers(Bridal Shop Owner)