The team strive to narrow down a motive when a Navy recruiter is killed in a hit-and-run. Meanwhile, Lasalle worries about his brother.
The team reaches a breaking point with Anson; Pearce puts Michael in charge of a big mission; Sam and Fiona run reconnaissance.
Charlie decides to tell the house about her bust; Briggs must come clean; Mike believes his investigation is ending.
Season Four Premiere. New Orleans celebrates the election of Barack Obama; Desautel opens her own Bywater restaurant; LaDonna rebuilds Gigi's bar; school band director Batiste gets invested in his students' lives.
LaDonna confronts the return of the crime problem; Sofia channels her father's YouTube rants; Toni takes the Abreu case; Janette and Albert apply for Road Home money; Sonny barely escapes arrest.