Katherine Heiny answers readers questions about Standard Deviation, her hilarious novel about marriage, parenting and the road not travelled. Audra is married to Graham, who is divorced from Elspeth. While Audra is sociable, loving, outspoken, tactless, kind and funny, Elspeth is contained, reserved, controlled and reticent. Despite loving Audra, Graham begins to wonder if his life should have taken a different path. Katherine Heiny reveals the real-life moments that inspired the book, her love of the funny side of life and why she can never pass up on writing a good joke. Upcoming recordings at BBC Broadcasting House, London Wednesday 15 November at 1300 - Donal Ryan on The Spinning Heart Wednesday 13 December at 1830 - Elly Griffiths is our guide to The Moonstone by Wilkie Collins Email [email protected] to take part.