The 'Amazing' Mrs Ros Pritchard is the successful manger of Greengages Supermarket in Eatanswill. When a couple of local politicians make a spectacle of themselves outside her shop, Ros decides to stand for election herself – just to prove that she could do better. Supported (reluctantly) by her husband, Ian, and daughters Emily and Georgina, she begins her campaign, inspiring other women to follow her lead and stand on the same platform. Even the formidable Catherine Walker, the Tory Party Shadow Health Minister, is won over by Ros' charms and defects to her Purple Alliance Party. Meanwhile, Emily manages to break up a wedding and Ian's antics at a work Christmas party nine years ago are plastered all over the papers. Ros' story grips the nation and eight weeks later no one is more surprised than Ros herself when she wins the General Election and becomes the next Prime Minister.