A crisis looms at City Hall when the police and fire unions unite against cross-training, and investigators search the Mayor's offices for evidence that Da Vinci over-stepped his authority in his dealings with Chief Jacobs. Klotchko maneuvers to cover his tracks in the grow-op shooting. Brian Curtis encourages the witnesses testifying against Dubreau to leave the country.

Da Vinci scrambles to prevent a war between the police and fire unions when rumours emerge of a cover-up in the grow-op shooting case. But his grip on the city is undermined by bad press, opposition from the Solicitor General, and defections on City Council. Jacobs and Klotchko scheme to neutralize an increasingly unstable Jan Ferris.