Sisters Constance and Gwenyth Little occupy an unusual place in the firmament of GAD. Together they wrote 21 novels and, thanks to the Rue Morgue Press reissuing them in the early 2000s, there’s sufficient awareness around them for the term “forgotten” to be thoroughly inappropriate…but you’d have to be a genre nerd to name more than a handful of their books. Their lack of a series character and the fact that they wrote no short stories (and a single novella, presumably harder to anthologise) doubtless play a part, but I think more telling is the fact that they’re remarkably difficult to pigeonhole. You’re never quite sure what you’re getting, and that cuts both ways.