A Brilliant Hacker. An Unbreakable Code. A Fortune at Stake.

When a powerful supercomputer is stolen, overnight fortunes vanish from Europe’s leading companies. Forensic technician Roger Tross is assigned to track down the elusive thief across Berlin, Prague, Vienna, and Budapest.

Teaming up with cryptographer Julia Amborn, Roger races to uncover the shadowy mastermind behind a cyber heist that could shift the balance of global power. As the investigation delves into advanced mathematics, the line between justice and digital anarchy blurs, forcing Roger and Julia to confront an ethical dilemma at the very core of the digital age.

Fans of Michael Crichton, Blake Crouch, and cybercrime fiction will enjoy this fast-paced techno-thriller filled with ethical challenges, high-stakes puzzles, and a scientifically rich mystery at its heart.

The Ruby Circuit (Rubinkretsen) is Martin Ljungqvist's debut novel. A thought-provoking thriller about mathematics, technology and encryption and their impact on society.