A series of revelatory hallucinations that Philip K Dick experienced in 1974, radically altering his view of belief, time and history, were the inspiration for his quasi-autobiographical novel Valis which was published in 1981. Professor Sarah Dillon joins Prof Roger Luckhurst (Birkbeck) and presenter Matthew Sweet on BBC Radio 3’s Free Thinking on Thursday 19^th October, to unravel this deeply strange book and to discuss how Dick’s experience of mental illness and his tireless attempts at self-diagnosis thread their way through his novels and short stories, despite being largely absent from the many film and TV adaptations of his work, including Blade Runner, Total Recall and Minority Report.