I first met the twins when I started university. Freshers week. We became friends. They were odd looking and wore black clothes, black lip gloss and black eyeliner, but then people had always thought me strange, the way I looked and behaved, so perhaps we matched. That first term, we went for coffee or a drink. Just now and again. It was the sort of friendship I’d had through school; the nerdy and unpopular girls sticking...