During their attempt to arrest a Petty Officer and a suspected drug-smuggler at Pax River, McGee is left injured when the Officer's dog attacks him. As the team try to get to the bottom of the Officer's death while also trying to dissolve a ongoing drug ring at the Pax River Naval Air Base, Abby, believing that the dog is innocent puts both her career as a Forensic Scientist and her future at NCIS on the line as she seeks to prove that the dog is innocent and that someone else is responsible.