7/10 Gunfire at the Madrid nightclub, and a dying man's confession.
6/10 A lingering scent of perfume may give a vital clue to the latest murder.
5/10 A sinister shop in the East End may hold a vital clue.
4/10 Another death, and this time the killer comes very close to home.
Mike returns home 30 years after his teenage sister's disappearance.