Sugarland: Live On the Inside (7 p.m., Ch. 4): The country group performs in this hour, which is interspersed with behind-the-scenes footage.
The Great American Road Trip (7 p.m., Ch. 5): The remaining families travel to the Grand Canyon.
Invitation Only: Brad Paisley (7 p.m., CMT): The country singer performs.
Britain's Nazi King? (7 and 10 p.m., National Geographic): FBI files indicate that the Duke of Windsor — Edward VIII before he abdicated — may have leaked secrets to the Germans during WWII.
The Closer (7 p.m., TNT): Identity theft leads to murder.
Raising the Bar (8 and 10 p.m., TNT): Jerry tries to keep a client out of prison long enough for her to help her son get into college.
The Secret Life of the American Teenager (9 and 11 p.m., ABC Family): Everybody is back after summer vacation.
Jon & Kate Plus 8 (10 and 10:30 p.m., TLC): New episodes are scheduled. How this will work, now that Jon is reportedly engaged to somebody else, I have no idea.
Deadly Waters (10 p.m., Discovery) and Day of the Shark 2 (11 p.m., Discovery): Two more scary shows about sharks.
Nurse Jackie (11:30 p.m., Showtime): O'Hara tells one of the nuns about Jackie's secret.