A Marine stands accused of fatally shooting his wife. Mac prosecutes, and Harm defends. Bud and his father have trouble with Bud's condition, but each starts to cope. Nearly everyone gives Loren a happy farewell; Sergei returns to Russia.

A RIO dies of hypoxia, traced to contaminated oxygen. Mac prosecutes the PO apparently at fault, Harm makes a poor defense, and Sturgis takes over. Harm runs into more trouble, but he finds the truth. Bud resents Harriet's protectiveness.