During the season four finale, Team One races to a hospital when Fire Captain Simon Griggs interrupts the attempted murder of a badly burned firefighter. When they corner the suspect, the team learns he’s behind a series of deadly fires in the neighbourhood. Meanwhile Fire Captain Simon Griggs is forced to make a horrific choice – one that pushes him to the edge of revenge and suicide. Parker, wrestling with his own decision about his future on Team One, must convince this broken man to live.
Hijackers commandeer a passenger jet to bargain for a prisoner release. The lives of forty passengers and crew hang in the balance of negotiations over the prisoner, a relative of the terrorists. An ambitious passenger irks the hijackers, when she starts to text the police. Team One eventually storms the jet at the city airport. Stressed, Parker agonizes over shooting the hijackers.