Daphne, Girl Detective
S2:E4
1961
IMDb
Daphne invites a friend of hers and her actor husband to a party on the houseboat. The couple argue and leave separately. He waits for Daphne's friend and kills her. Daphne strongly suspects this, but since Lt. Plehn and the SurfSide detectives refuse to listen to her theories she decides to take matters into her own hands.