Gerry faces a blast from his past, while the team reinvestigate an arson attack on a school.
A 10-year feud between two families over their rival ice cream businesses turns nasty.
A police informant returns to the UK, claiming he has fresh evidence about an unsolved bank robbery.
The team find themselves at the centre of a plot involving witchcraft, magic and curses.
The murder of a police informant is reinvestigated, bringing back painful memories for Jack.
A spate of violent dog killings are re-investigated when it emerges the culprit may be back in action.
The murky death of a Union's General Secretary in 1975 is reinvestigated.
The case of Nancy Murray, who died at the wheel of her husband's prized sports car, five years ago is reopened.
