Set in San Francisco, Jonathan and Jennifer Hart are faced with the prospect of being reunited with Jonathan's long lost sister, and her nephew. Is it possible that Jonathan will finally discover a key to his past or will the "family" turn out to be after something, putting Jonathan and Jennifer in danger's past one more time?
Jonathan and Jennifer Hart are in San Francisco to help with a charity auction. Jennifer picks up an old locket for auction and shows it to Jonathan. Jonathan quickly recognizes a picture of him and his sister who he hasn't seen since he was a child, inside. Stuart Morris approaches the Harts claiming to be Jonathan's nephew. Stuart tells them that his aunt is Mr. Harts long lost sister. Perhaps, this family reunion isn't quite what it seems...