Leo, Harry and Nikki step up their efforts to discover the truth behind the train crash but there are still many unanswered questions.

Leo and his team are approached by a support group to help discover the truth behind a train crash.

Foul play is confirmed when it emerges that both the horse and the helicopter pilot were drugged. Could syndicate member Matt Gibb be responsible?

The death of a jockey during a race becomes more complicated when the horse's owners are killed in a helicopter crash.

Leo hunts for the source of the children's symptoms before any more fatalities occur. Meanwhile Harry discovers the truth behind Nick Garner's death.

Suspicious symptoms afflicting a group of children on the coast may be linked to the death of a local man.

The case takes an interesting turn when the bodies are identified as brothers who disappeared after a police questioning during the Troubles.

The bodies of two young men are discovered, partially exposed, following a landslide on the coast of Northern Ireland.