The Alexanders are the kind of family you're always seeing in the Homes sections of the weekend supplements, surrounded by lots of white and complicated lighting set-ups. Carla is a stay-at-home mum, busy raising their two young sons whilst being the devoted wife and support to her husband Tom, a fashionable furniture designer. However, when their best friends announce their divorce-lite - an amicable split where they will still live together but have separate love lives - cracks begin to show on the smooth veneer surface of Carla and Tom's perfect marriage. Cracks which will need more than a few tubs of Polyfilla to cover over. Adept at dealing with all the exteriors of their lives, from scary headmistresses to stroppy scaffolders, ever-efficient Carla comes up with a startling scheme to get them through their marital crisis. And one that she has no plans to share with her husband