We return again during the third season, which returns strongly to complete the events of that series. The season begins as the investigation into the murder takes Perez and Touche to Glasgow as they try to uncover the reasons behind the brutal death of Maguire and his association with Robbie Morton. But the old ghosts are chasing Perez as his enemies try to stop him from reaching the truth. On the other hand, De-Jimmy Perez is convinced that Michael Maguire is fully involved in the death of Robbie Morton where it seems surprising.