A Marine's murder reveals new clues in the first case LaSalle and Pride worked together after Hurricane Katrina; a Thanksgiving celebration at Pride's bar.

Pride and Mayor Douglas are abducted from their respective Mardi Gras events and held captive by a mysterious assailant.

A Navy culinary specialist is the target of an explosion while visiting her family's restaurant in the French Quarter. Also, Brody is in D.C. tracking a lead in the General Mathews leak case.

When the Coast Guard boards a yacht that is in an area that is used by smugglers, they find the Captain with the crew's waiter who is dead. They try to get him but he resists and kills him. The Coast Guard calls Pride because the yacht belongs to Javier Garcia. Pride thinks Garcia was smuggling something. He calls the FBI to tell them about it and sends LaSalle to help Gregorio. Pride discovers one of the passengers is someone he knows and that she's engaged to Garcia. Instead of arresting the men who took off the yacht what they were bringing in Gregorio decides to follow them instead if arresting them but things don't work out as planned. Isler wants Pride's friend to help them but Pride says it's too dangerous but she agrees to do it.

While Pride listens in on a wiretap of Mayor Hamilton (Steven Weber), the NCIS team investigates a train heist of hundreds of Navy weapons. Featuring a two song performance by GRAMMY Award winner Sheryl Crow from her upcoming album By Myself, including the first single "Halfway There" and the world premiere of "Roller Skate."