A week can be a long time to spend with your family It's Christmas & the Birch family are coming together at their second home in Norfolk Emma & Andrew's daughter Olivia is back for the first time in years & while Emma is elated at them all being under one roof her younger more frivolous daughter Phoebe is braced for inevitable clashes But aid worker Olivia is only home because she has nowhere else to go Having recently returned from Africa where she's been treating a life-threatening virus she has been told that she must stay in quarantine for a week & so too should her family For the next seven days no one can leave the house & no one can enter It doesn't sound too hard But a week with your nearest & dearest can feel like an eternity especially when they're all harbouring secrets One of whom is about to come knocking on their door