The series ends with a focus on Harlee's choice to face imprisonment as a form of personal penance.
Her key witness, Detective Cole, fails to show up. Harlee tracks him to a ferry where he is fleeing the city, and though he urges her to run as well, she refuses. Shades of Blue - Season 3Eps10
Harlee prepares to testify before a police commission against the corrupt Captain Jordan Ramsey. The series ends with a focus on Harlee's