Plot: Midsomer's Chettham Park House, once owned by Sir William Chettham, has been bought by entrepreneur Jack Filby to save Sir William from financial ruin. Long-term friends dating back to the days of university, Jack has allowed William, his mother Elizabeth, wife Isobel and son Freddy to stay on living at The Dower House - the smaller house on the estate where the Baronet's widowed mother would traditionally live