Mimi may "have it all' - the house, the children, the part-time vanity job, the skinny jeans, the feng shui guru - but life chez Fleming is not as cushy as she'd like. Husband Ralph prefers the trout stream in Wiltshire to the fast lane of the W11. So when Mimi meets Si, the new party billionaire on the block, at a shushi party, she soon faces a choice of keeping up, or keeping it real.