Magnum is trying to protect Carol, who is in the middle of a particularly controversial court case, when he is hired by a woman from the mainland to help locate the birth certificate for the child she gave up for adoption 30 years ago. In doing so he becomes embroiled in Carol's personal life, as he discovers a powerful secret about her parents and her true birthright that could shatter her.
- Tom Selleck as Thomas Sullivan Magnum IV
- John Hillerman as Jonathan Quayle Higgins III
- Roger E. Mosley as Theodore "T.C." Calvin
- Larry Manetti as Rick Wright