Cognitive Grammar analyses the semantics of linguistic features in relation to human cognition; Free Indirect Style allows authors to represent their characters’ cognition with language. This article applies Cognitive Grammar to the analysis of a character’s mind that is represented with Free Indirect Style. In the tradition of mind style analysis, it aims to use linguistics to reveal some of the underlying cognitive processes and proclivities at work in the character’s psychology. The character in question is the protagonist in Malcolm Lowry’s Under the Volcano, an alcoholic who is largely characterised by his drunken behaviour and ideation. This article therefore focuses on the linguistic features that serve to represent his inebriated state of mind. It analyses the semantic effects of those features primarily in terms of attentional focus, drawing on Cognitive Grammar concepts, such as objective construal, specificity, scope, profile and domain, and relating these to the protagonist’s cognitive proclivities for solipsism, partial awareness, delayed reaction, attenuated experience and self-delusion. The article also discusses the theoretical background for mind style analysis, arguing for the continued importance of focusing on the relationship between the text and a character’s mind, alongside the focus on the reader’s mind that has come to dominate cognitive stylistics.