Twins Katy and Rachel don't know much about each other's lives anymore. Rachel thinks that Katy is a high-flying event planner in London, while Katy thinks that Rachel lives in idyllic marital bliss in the countryside. Each sister believes the other has created a perfect life - but the truth is that neither twin has the life she pretends she does. And when these sisters unexpectedly swap houses for a week, they're in for a big shock. But it might just be the wake-up call they've both been waiting for.