Sarah makes an unexpected discovery.

Sarah tries to blackmail Gumbiner-Fischer.

Sarah buries her husband and attends the funeral of the drug company's security head, where she confronts Dr. Hoffman, whom she believes is behind the string of deaths.

As the investigation into the international conspiracy is shut down, Sarah and DS Byrne continue to dig into the cause of the many deaths connected to the drug company, which seem to be connected to a plot of land owned by the company. Season finale.