The most perfect lives can hide the darkest secrets... Mary has everything. Beautiful and rich, she lives on an exclusive street in the heart of the city, in a house with gorgeous views and an immaculately maintained garden. Her life looks perfect. But behind closed doors the truth is very different. Her husband Andrew barely speaks to her, spending his days down in the basement alone. Her teenage nephew is full of rage, lashing out with no warning. Her carefully constructed life is beginning to fall apart. And then someone starts sending Mary anonymous notes, threatening her and her family... Everyone has secrets. But is someone at number 13 hiding something that could put the whole family in danger?