Following her ugly break-up with Dalton Lowne, Mac has reason to believe that he's stalking her -- until he's killed during an apparent car-jacking and the stalking continues. Much to Harm's dismay, the strain of the two events pushes Mac to the edge -- and to the bottle. Concerned for Mac's safety and sobriety, Harm intensifies his search for Mac's tormentor before he causes her bodily harm.

Mac's ""little sister"" unexpectantly shows up at JAG headquarters, declaring that she's run away from her abusive stepfather. While she investigates whether Chloe has been abused, Mac has her hands full keeping her from turning the office upside down, then learns that her real father is still alive serving on a ship in the Navy. Despite the cost, Mac convinces the Admiral to allow the two to talk to each other via satellite video-conferencing.

Meanwhile, Harm spends the evening interrogating a beautiful Navy doctor arrested for DWI after she lost control of her vehicle on icy roads and ran over a Nativity scene. Harm agrees to defend her when he learns that just before the accident and before she took the breathalyzer test, she had drank some liquid cold medicine (which contains 25% alcohol)

Adm. Chegwidden's attempts to fly to Italy to spend Christmas with his daughter, however, with the Washington, DC area mired in snow, most of the flights out have been cancelled.

Harm and Mac are assigned to prosecute three sailors charged with the vicious beating of a man they say raped a fellow shipmate. The rape victim, Petty Officer Lopez, tells Mac that, after an evening of drinking with her three male shipmates, she found herself alone at the bar where they ditched her as part of an initiation into their team. The next morning when she awakened in her car, she realized that she had been raped. When the shipmates heard Lopez's story, they exacted revenge on the man they thought attacked her -- the bar owner. But as Harm and Mac wear down the testimony of the three sailors, a very different story about what happened that evening begins to emerge.

This episode starts with tying up the loose end of Mac being charged in an Article 32 hearing for perjury (People vs. Mac). She is acquitted, thanks to fancy legal-speak from Harm - although she does not have to face a court-martial, she does end being sent up on an Admiral's Mast, which just might be worse.