The Virago Book of Twins and Doubles
I have been reading The Virago Book of Twins and Doubles for AGES in this nibbley-nibbley way, and very satisfying it's been, too. I didn't buy this because I'm particularly interested in twins (though I have a twin niece and nephew, and twin brothers who died at birth), but because the editor is Penelope Farmer, who wrote the haunting Charlotte Sometimes. It turns out that Farmer was herself a twin, and the memory of her deceased sister hangs over this volume. Of course Charlotte Sometimes is also a story of doubles, separated by time.
Twins as freaks, twins in myth, the writer as twin, twins as curse and as blessing... this anthology is an ordered jumble of fact and fiction, poetry and newspaper snippets. There were several extracts from a compelling book I remember reading in high school, about The Silent Twins, June and Jennifer Gibson, who communicated only with each other, became arsonists, and were locked in Broadmoor for many years. Jennifer died, for no apparent reason, at the age of 29, perhaps to 'set June free.' Many of these twin tales carried a similar eerie shiver.