Kate Moore - a mother with an interesting past - is living the quiet life in another European city, or trying to. On her way to drop her children off at school in the city centre, the cafes and streets of Paris start to come alive around her. Kate's husband Dex, meanwhile, charged with finding a particular present for their son's birthday, is struggling to focus on the job in hand as a financial matter at work seems to be playing on his mind. As worrying reports begin to circulate from key locations around the city, and the sound of wailing sirens becomes increasingly hard to ignore, could their day and, indeed, their lives be about to change forever?