Patricia Wentworth 
Benevent Treasure [EPUB ebook] 

There is a curse on the Benevents . . .Somewhere among the dust and cobwebs of the sinister Benevent Mansion lies the legendary Benevent treasure. But a terrible death has been prophesied for whoever uncovers it.When Candida Sayle is invited to visit her elderly maiden aunts, she dismisses such gloomy thoughts. But as Candida begins to discover the family’s dark secrets she puts herself in grave danger.Thankfully Miss Silver has investigative skills of her own.