Domestic Noir: Riding the dark tracks to fame

''I like the darker edge of things," Paula Hawkins admits. Too bad, then, that the author of The Girl on the Train is enduring such a sunny spell. Her debut novel is a runaway success on both sides of the Atlantic. The movie rights sold before the dark psychological thriller went to print - DreamWorks promises release late next year - and in its first four months, sales overtook the early numbers of both Fifty Shades of Grey and Gone Girl.