A five-year-old girl dies by strangulation during a school field trip to a Naval museum in Washington, DC; nobody reports a corresponding missing child. Harm takes a strong personal interest in the case, so he gets the admiral's consent for him to investigate; he calls in LCdr. Teresa Coulter, a pathologist. Autopsies show a history of malnutrition and physical abuse. With Bud's help Harm finds a source of information, which takes him to another lead, which takes him and Teresa to the victim's twin sister, who's alive. They learn the identity of the killer, and Harm resolves to pursue him until he finds him. Meanwhile Bud passes the bar exam on his first attempt.