Mark Williams has been all over the bestseller lists, but you may not recognize his name. That’s because he is one half of a writing duo called Saffina Desforges. Their debut novel Sugar & Spice was a smash hit in the UK, with the controversial crime thriller racking up 100,000 sales. They haven’t broken out yet in the US to the same extent, but the release of their second novel Snow White – the first in the Rose Red series – could change all that. Here’s what Mark had to say about urban writing myths, working in a partnership, and his ambitious plans for the future.