Dean Jones, star of The Love Bug, came back to the fold for this third lap around the block, which finds him racing in Monte Carlo while thieves plant a stolen diamond in Herbie's gas tank. The plot is forced and conventional, but the cast is the thing: the excitable Don Knotts (The Apple Dumpling Gang) and the tormentable Roy Kinnear (Willy Wonka & the Chocolate Factory) are good men to have in a potboiler such as this. --Tom Keogh