A car bomb explodes, killing the Vice President of Sawchuck Industries. In their search for suspects, Chase and August meet Meredith Nowell, a beautiful young volunteer at Green Planet, an environmental protection league. Meredith reveals that Sawchuck Industries had been dumping deadly toxins, which infected Los Angeles groundwater, killing a mother and daughter. When another Sawchuck executive is killed in an explosion, the detectives begin to suspect Joshua Duncan, the man whose wife and daughter died of cancer as a result of the poisoned water.