NCIS investigates the murder of Lt. Patrick Nolan when he is shot and killed while on a dinner boat with his sister and uncle.

Having just returned from Afghanistan, Patrick was the son of the late Richard Nolan, millionaire businessman.

Richard cut Patrick out of his will because Patrick decided to serve his country rather than run the family business.

Autopsy results reveal that the shooter was at least 20 feet away from Patrick, who was on the deck, when he was shot.

Abby concludes that 15 feet away either meant that the shooter was in the water or on another boat. All the other guests on the boat are eliminated as suspects.

Patrick was an exemplary Marine but he was recently charged with assaulting Devon Lodge, an ex-classmate upon his return to the states.

Tabloids reveal that Patrick’s sister, socialite Kimberly, recently dated Lodge and photos were leaked indicating that Gavin slapped her around.

Gavin claims to have nothing to do with Patrick’s death.

Things get even more complicated when Abby finds someone else’s blood on Patrick’s body. Someone else was there with Patrick and was possibly shot as well.

A second boat used to carry our shooter was owned by the Lodge’s family. Another body found turns out to be our shooter who happened to be a gun for hire.

The mastermind turned out to be Kimberly Nolan and the company’s CFO.

Right before Richard Nolan died he revised his will leaving everything to Patrick, who decided to use the family wealth to start a charitable organization.

Kimberly was there when Patrick was shot and was grazed in the arm. ­