Agatha Christie's Hercule Poirot and the Greenshore Folly is available as an ebook with the print version being released next year.
Official blurb: In 1954, Agatha Christie wrote this novella with the
intention of donating the proceeds to a fund set up to buy stained glass
windows for her local church at Churston Ferrers, and she filled the
story with references to local places, including her own home of
Greenway. But having completed it, she decided instead to expand the
story into a full-length novel, Dead Man's Folly, which was published
two years later, and donated a Miss Marple story (Greenshaw's Folly) to
the church fund instead. Unseen for sixty years, Hercule Poirot and the Greenshore Folly
is finally published in this eBook exclusive edition, with a new cover
by Agatha Christie's most famous cover artist, Tom Adams.