The Open House: An Inspector Appleby Mystery (Book 26)

When Inspector Appleby's car breaks down on a deserted road one dark night, he happens upon an imposing mansion, whose windows are all illuminated. His sense of curiosity gets the better of him when he discovers that the front door is wide open, and he gets a funny feeling of being watched as he wanders round this splendid house, looking for signs of life. When he finds an elaborate feast laid out, he wonders who is expected.