Rumors of a cover-up pertaining to a grow-op shooting case force Da Vinci to defuse the threat of war between the police and fire unions. Meanwhile, Jacobs and Klotchko attempt to neutralize Jan Ferris.
The police and fire unions unite against a cross-training initiative; Da Vinci is investigated for his dealings with Chief Jacobs; witnesses testifying against Dubreau are encouraged to leave the country.
Threats of a union war weigh on Da Vinci when an investigation determines that Fire and Rescue may have contributed to a police officer's death. Meanwhile, Brian Curtis and Chief Jacobs become involved in the pedophile case.