As well as being an international bestseller and the basis for a Hollywood film, The Girl On The Train is one of the best modern examples of “the unreliable narrator” – and what this term can mean for mental health. The story follows an alcoholic divorcee who ruminates over her failed marriage and (mis)remembers how her drunken episodes led her to lash out at her husband. A pitch perfect crime thriller, this is also an important story about the effects that “gaslighting” can have on the mind.