Parnell Park is an ordinary suburban street. Alice from number 25 has a quiet life but she craves more. So she watches the street's inhabitants -- taking a special interest in Kevin and Kim, the beautiful, charming couple from across the road -- wondering what goes on behind closed doors.

One day, on a visit to London, Alice sees Kim on a passing train. But when she later mentions this to Kevin, he tells her she has made a mistake, insisting that his wife is on holiday in the West of Ireland. But Alice knows what she saw.

So who is lying? Kevin, or his wife?Alice feels compelled to investigate, and her concern for Kim quickly intensifies. And as she enters a high-stakes game with shadowy rules and hidden dangers, Alice is soon to find out that the thing you crave can be the most dangerous thing of all. Set over the course of a sultry summer, I Know I Saw Her is a masterfully told suspense novel about desire, appearances and deception, as compelling as it is creepy, full of unexpected turns.