“In The Exphoria Code, Antony Johnston delivers a crackling fuse-wire of a book with a plot torn from next year’s headlines and an understanding of contemporary spy-craft that will make your head spin. This is very possibly the definitive espionage thriller of the early 21st century.”

– Alan Moore

“Antony Johnston is a talent to look out for and this, his latest entry into the world of espionage, is a treat.”

– Anthony Horowitz

“Johnston does for hackers what le Carré did for short, fat office managers—turn them into spies you can root for.”

– Spywrite

“A really great, page-turning read.”

– BBC Radio Ulster

"Sharp turns out to be quite resourceful, physically and mentally, and thrilling action scenes keep the pages turning..."

– Publishers Weekly

"A fast-paced and cleverly constructed story that uses many of the familiar spy-novel tropes but does so in exciting new ways. Johnston makes good use of jargon and technical terminology to give the story an air of realism, although the story pushes itself right to the edge of plausibility, cleverly adding to the suspense. A rousing success."

– Booklist

"Readers will thrill to the chase in this kickoff to a techno-thriller series that has at its center a hacker with a heart of gold—and nerves of steel."

– BookPage