A body found on the Boston wharf pulls Lena and Danny into a tense drug investigation alongside Lena’s former partner, Detective Brian Rodgers (Ryan Broussard), sparking personal and professional friction. Jonah and Sean chase down a missing man tied to a scavenger hunt, while Sarah and Mae navigate emotional challenges at home and in court.

Lena and Danny are pulled into a high-stakes murder investigation when a whistleblower tied to one of Mae's court cases is found dead.

NYPD detective Danny Reagan teams up with Boston detective Lena Silver to investigate a deadly fire at a tech company.