In the book, a traumatic event, and the burden of keeping it a secret, eventually becomes too much for Georgia. In Diana's life, her twin, Paula, was always shadowed by a depression that, in the end, became so unbearable that she committed suicide seven years ago. Already a small, neat person - even her corkscrew curls seem delicately and deliberately arranged in place - Diana seems to shrink into herself even more when I ask about Paula.