Hilda van Stockum's book about a Dutch miller's family in wartime Holland was originally published by Farrar Straus & Cudahy (later Farrar Straus & Giroux).
It passed 55,000 in sales in the first quarter of 2016. It is sold by Bethlehem Books.
This is a very high sales figure for a book that was allowed to go out of print. At $15 per book, that amounts to $825,000 in revenue. The book generates about $40,000 in sales per year.
So by 2020 it will have generated about $1 million in reprint.
A companion book that van Stockum wrote to The Winged Watchman is about a Nazi-occupied house in Amsterdam. It is called The Borrowed House.
A new edition is about to be released by Purple House Press in Cynthiana, Kentucky, which was founded by Jill Morgan.
The new edition will have a foreword about HvS's life by me and an endnote by Christine Schintgen with information about HvS's writing.