Donald Sidwell, an aristocratic, elderly gentleman, races home in his vintage car to Sidwell Hall and attempts to drag his agoraphobic daughter Olivia outside as shock treatment. Meek employee, Terence Brooks, summons the courage to tell him to stop. Later the family, including Olivia's brother Edward and niece Lily, find Donald repeatedly stabbed to death behind a locked door. When Davey and Jane arrive to interview the family, they all claim to have been together when Donald was killed. Local gossip from Jane's Mum, Judith, together with Jane's careful questioning, begin to show the cracks in this family's story. And where is their priceless family heirloom, Napoleon's Violin?