The story, set in San Francisco, depicts the adventures of Allison Sydney Harrison, a high-school student who teams with her wealthy private-detective father David Harrison to solve crimes. In the pilot, Allison and David team to solve the murder of a beautiful woman. The prime suspect is their chauffeur, Pat Rosetti.
| Actor | Role |
|---|---|
 Katy KurtzmanAllison Sydney Harrison | Allison Sydney Harrison |
 Ted DansonDavid Harrison | David Harrison |
 Corbin BernsenSteve Malloy | Steve Malloy |
 Don CalfaPat Rosetti | Pat Rosetti |
 Hans ConriedArt Appraiser | Art Appraiser |
 Charles HallahanSgt. Beatty | Sgt. Beatty |
 Cynthia HarrisClarisse Spencer | Clarisse Spencer |
 Elaine JoyceValerie Parker | Valerie Parker |
 Clyde KusatsuJimmy | Jimmy |
| DDan LeegantDet. Davis | Det. Davis |
 Macon McCalmanThe Dean | The Dean |
 James McEachinLt. Jesse Herman | Lt. Jesse Herman |
| SStanley Ralph RossKarate Instructor | Karate Instructor |
 Billy SwanDoorman | Doorman |
 Ellen TravoltaJoyce | Joyce |
 Granville Van DusenWalt Spencer | Walt Spencer |