Threshold will be published by Bloomsbury in early 2020.

“Always intriguing and often enlightening, offering a glimpse of the anxious yet pleasing rationale of a mind struggling to live in a rational world.” Publishers Weekly

‘Threshold, and the narrator, whose brilliance and humour on literature and drugs, sex and boredom, leave me in awe.” Rachel Kushner

'Super charming, super funny, and super smart' Rachel Kushner 

'This is the funniest novel I've read since January...its unashamedly navel-gazing, slyly cosmopolitan and an absolute blast' The Daily Mail

‘Threshold is audacious, daring and deranged, endlessly entertaining, furiously funny and – to hurtle to the other end of the alphabet – wonderful… highly original” Geoff Dyer

‘a brilliant,  maverick achievement. A Pilgrim's Progress for our time.’ Mike McCormack

‘Doyle has outdone himself. I was buzzing after reading Threshold: it's the kind of work you have to come down from – playful, potent, lurid, moving and fearless.’ Lisa McInerney

“Threshold is extraordinary, quite unlike anything I’ve read before. It’s intimate, a revelation in the literal sense of that world, and yet it’s full of curiosity. It’s hit me right in the gut, made me think about my own life and the things that I’ve done in it. It’s fearless and challenging, inventive and compulsive, unique and utterly heartfelt. A book that will stay with me for a very long time. Masterful.” John Boyne 

‘an extremely funny book, a novel that sends itself up mercilessly even as it is created. His best work to date.’ - Kevin Barry

'It's dazzling. This book confirms his status as one of the most original and intelligent writers at work today.' - Donal Ryan

‘Confidently told… The masterly narrative pacing brilliantly counterbalances lurid episodes and sometimes terror with devastating wit and epiphany. As ever, Doyle’s prose is compulsively readable, and his insights always credible and occasionally astonishing.’ – John G. Matthews