This essay draws on Julia Kristeva's concept of 'borderline' experience, a feature of psychotic discourse, to examine the representation of madness, split personality and sociopathic behaviour in James Hogg's The Private Memoirs and Confessions of a Justified Sinner and the contemporary, muted Gothic of John Burnside's The Locust Room (2001). The main characteristics of borderline experience - a concern with authenticity and the proper name, with uncertain boundaries between inside and outside, truth and delusion - are central concerns in Hogg and Burnside, and the essay assesses the value of borderline discourse for a critical reading of madness in Gothic