Antonia White was one of the first writers to appear in the Virago Modern Classics series, and is best known for her first novel, "Frost in May", a largely autobiographical account of her time at a convent school at the beginning of the last century. While "Frost in May" does not exacty paint a pretty picture of life under the nuns, it isn't necessarily anti-Catholic in its view point. It seems that the author had a love/hate relationship with the Catholic Church that lasted all her life. She's on safe ground when writing about her religion, and three of the eight stories in this collection are inspired by the rather unrecontructed Catholicism (by modern standards) of the time.
The other major themes in these stories are mental illness and the asylum. Again the author is speaking from personal experience, having had a breakdown as a young woman that led to her spending time in the Bethlem Asylum, London. Perhaps this doesn't sound too cheerful! But the stories are never morbid, just honest.
Generally speaking I tend to give short stories a miss. There isn't the time to get properly into them like there is with a novel.
But these stories are often thought-provoking, as well as easy to read.