NorBAC investigates an outbreak of prion disease (mad cow) in humans. With the victims spread out across North America, how are the cases connected? In the aftermath of Hiras's death, David is determined to expose the fraudulent Reverend Walsh. David suspects that his old friend Danny, a hockey player, is using a dangerous performance-enhancing steroid.

NorBAC reviews an experimental treatment being tested on children with Leukemia. Just as they are about to declare the cancer therapy safe, another child dies. David disregards the proper channels and goes to Nunavut to get a sample of what he believes is the Spanish Flu virus from a frozen corpse. Mick and Lilith go whale-watching in Quebec and Lilith begins to realize just how sick he is.