Wanted: young person to render general domestic assistance. According to Bert and Alice, two surly servants who work for the formidable Miss Farnaby (Geraldine McEwan), he notice should read: "Wanted: masochist to be at the beck and call of cantankerous old trout." Fortunately, Mulberry has never meet Bert or Alice. In fact, no one knows where he comes from. Out of the blue, he just turns up one day at he family mansion, without a single qualification to his name, and sweet-talks his way to the job. Suddenly, the dull old house is not dull anymore and Miss Farnaby's life will never be the same again. But who is the mysterious stranger in black, and what does he want with Mulberry?