Amelia has everything: two perfect children, a successful husband who loves her, and a big house in London's affluent Blackheath. So why does she wake up one morning with a distaste for her daughter and an unexplained attraction to James, a dad she sees in the playground at drop off? James has everything: a happy marriage to poet and fellow academic Alice and two children they both adore, sharing the childcare and fitting it around their work commitments...