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

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

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.

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

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

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