Having packed their kids off for the weekend, the "Earl and Countess of Ryhall" (Cary Grant and Deborah Kerr) are looking forward to a few days of rest and recuperation in their stately pile. Not that it's exactly private as they've long since had to allow the public to wander through at half-a-crown a time. One such visitor isn't so good at obeying the rules, though, when he ignores a "private" sign and walks into her sitting room. He turns out to be an American millionaire called "Delacro" (Robert Mitchum) and he's quite a charmer. So much so that he kind of sweeps her off her feet, and…