When a man collapses on a bus, possibly killed by an extremely contagious disease, the duo ends up confronting the leader of an eco-terrorist group.

After the president of an autistic association dies mysteriously, a new corpse is found. Though officially deceased days earlier, he is a suspect.

A woman is murdered, but the main suspect was in prison at the time of the events. The duo quickly realizes that it is the work of a serial killer.