If you're a fan of Golden Age detective fiction, especially that of Patricia Wentworth or Dorothy Sayers, this series will *be* a treasure for you. Clara Benson (1890-1965) wrote a series of mysteries featuring amateur sleuth Angela Marchmont in the 1920s and 1930s, but she never sought to have them published. In fact, her own family never even knew she'd written them, and only years after her death did her family discover the manuscripts.
Angela is an interesting detective figure: unlike her dowager-ish contemporaries Miss Silver and Miss Marple, Angela is thirty-something, attractive, divorced (?), and may well have been a spy in the First World War. She's recently returned to England after many years of living in the U. S. with her American husband.
These are classic British-country-house mysteries, and the third in the series is a particular delight, as Angela is joined on holiday in Cornwall by her god-daughter Barbara, a twelve-year-old spitfire who's like a junior Nancy Drew without any of Nancy's decorum. Barbara really makes the book work, which is good, since the plot is, by turns, both a little predictable and pretty far-fetched. Still, it's a fun read, and includes some great lines. In an exchange with fellow traveler George Simpson (who becomes an intriguing love-interest for Angela here), Angela remarks, "I don't believe I've ever read an improving book...but I understand they are meant to be good for the soul, if a little on the dull side. They will give you something to do during the long winter, though, when the social calls begin to peter out."
Great fun. And cheap: the first in the series, _Murder at Sissingham Hall_, is available for the Kindle for $1.29, and the other four books that have so far been published are $3.99 apiece.