After having been left by his wife, Spence comes to work drunk and endangers his life by entering a fire scene. After battling the latest massive warehouse fire lit by the pyromaniac, Nick lashes out at Det Sgt Diamond for her lack of progress in finding the pyromaniac. Diamond loses her temper and responds by revealing that Nick and his platoon-mates at the South East station are at the top of the Arson Squad’s list of suspects. Loyalties are put to the test when Spence is brought up on charges for drinking on the job.