Magnum tries to impress a beautiful "fan" of Robin's that he befriends, by showing her the Robin Masters estate, only to learn that she is actually a top security expect hired by Robin to test the estate's security. The security company she works for has been hired after Robin's life is threatened if he publishes his latest manuscript; and with him heading for one of three possible locations to collect some dictation tapes, she asks Magnum's co-operation in seeing that the estate is on top security in case it is the destination he's heading for. With the additional aid of T.C. and Rick, Robin's Nest is soon turned into a heavily guarded fortress, but there are parties out trying to see that Robin never makes it to his destination.