Brian Keith stars as bachelor Bill Davis, a highly-paid engineering consultant who lives in a posh Manhattan apartment with his proper English manservant, Mr. Giles French (Sebastian Cabot). Davis' carefree existence is turned upside down when his brother and sister-in-law die suddenly in a tragic plane accident, leaving their three children orphaned. Davis becomes an instant father figure to six year-old twins, Buffy and Jody (Anissa Jones, Johnnie Whitaker) and their big sister, Cissy (Kathy Garver). John Williams joins the family for 9 episodes, as Mr. French's equally unflappable butler brother. Guest stars include Butch Patrick, Eve Plumb, Joe Flynn and Jamie Farr.