Sarah and Holder's investigation comes to a close. Meanwhile, Richmond sets out on a bold new course; and a surprise source helps bring closure to the Larsens.

Sarah and Holder close in on the murderer. Meanwhile, the Richmond campaign preps for the election; and the Larsens seek to get their lives back in order.

A return to the casino winds up sending Sarah and Holder on the run, while Stan and Richmond face life-altering decisions.

Richmond lends support to the investigation; Sarah tries to track down Rosie's key; and Stan deals with his troubled son.

In the aftermath of the shooting at City Hall and Linden's discovery that the photo leading to Councilman Darren Richmond's arrest was forged, Sarah returns to Seattle to investigate a possible cover up and wonders if she can trust her partner.

The investigation refocuses on the casino; Stan has an uneasy face-to-face with Richmond; tension grips the Larsen house.

Holder disappears and a desperate Sarah goes looking for him; Stan decides to take matters into his own hands; and Richmond returns to City Hall.

An ominous discovery is made at the Larsen house while Sarah travels to Tacoma to learn Councilman Richmond's dark secret. Meanwhile, Richmond is forced to come to grips with the fallout from the attack at City Hall.

Sarah receives a message from the dead that may shed light on the identity of Rosie's killer. Meanwhile, Mitch befriends a young runaway; and Richmond has grave doubts about his future in politics.

Sarah teeters on the edge. Stan attempts to make amends. Richmond receives an unexpected boost in the mayoral race.

Sarah and Holder identify the mystery man with the tattoo while Jamie attempts to enlist Gwen's help and Stan learns his past may have come back to haunt him.

Sarah zeros in on a Larsen-family secret; Stan comes to grips with some past indiscretions; and Mitch takes in a runaway girl. Meanwhile, the Richmond campaign entertains a surprise visitor.

Sarah hunts down Rosie's backpack as Holder falls from grace. Mitch re-emerges while Stan continues to entangle himself with the mob. Richmond faces up to his situation.