The Secret of Chimneys
By Agatha Christie.
Agatha Christie’s The Secret of Chimneys, starring her sleuths Superintendent Battle and Lady Eileen “Bundle” Brent, is a murder mystery-treasure hunt crossover, considered to be one of her best early novels. The plot is a popular one, perfected by Christie: there are a bunch of people staying at a mansion when one of the guests is murdered!.
Harrow and Heston Classic Reprint. (1925) 268 pages.