Youngest son Jamie's life takes an abrupt turn when he's asked to become part of a clandestine investigation that could impact the family's legacy and reveal the truth about his elder brother, who died in the line of duty.
Bryan must stop an act of biological terrorism when invasive species are stolen from the Svalbard Global Seed Vault in Norway.
The hospital co-workers find it difficult when Josh's sister comes looking for him and Aidan can't be around blood.
Sally asks the pair to invite her fiancé to come round; meanwhile, Aidan receives some startling news and a hungry Rebecca ambushes Josh.
A teacher going through a messy divorce gets arrested under suspicious circumstances.