Aiming to become Boston's next District Attorney, Decourcy takes on a complicated and murky case involving a murdered police officer.

This season explores themes of financial inequality in Boston, specifically juxtaposing the "cloistered existence" of the wealthy Dryden family against the workers of the Big Dig.

Decourcy recruits Caysen to assist with the investigation. However, Caysen finds himself increasingly isolated and alienated from the other officers in his unit.

After receiving a distressing phone call, a dark secret from Siobhan's past resurfaces, adding to her current medical and professional stressors. Key Details Director: Christoph Schrewe Writer: Matthew Nemeth