Beginning in 2018, a powerful app for secure communications, called Anom, began to take root among drug dealers and other criminals. It had extraordinary safeguards to keep out prying eyes--the power to quickly wipe data, voice-masking technology, and more. It was better than other apps popular among organized crime syndicates, except for one thing: it was secretly run by law enforcement. Over the next few years, the FBI, along with law enforcement partners in Australia and parts of Europe, got a front row seat to the global criminal underworld.

Over the last decade, a single innovation has massively fueled digital black markets: cryptocurrency. Crime lords inhabiting lawless corners of the internet have operated more freely—whether in drug dealing, money laundering, or human trafficking—than their analog counterparts could have ever dreamed of. By transacting not in dollars or pounds but in currencies with anonymous ledgers, overseen by no government, beholden to no bankers, these black marketeers have sought to rob law enforcement of their chief method of cracking down on illicit finance: following the money.

Meet the Lazarus Group, a shadowy cabal of hackers accused of working on behalf of the North Korean state. It's claimed that they form one of the most dangerous criminal enterprises on the planet, having stolen more than $1bn in an international crime spree. Their targets allegedly include central banks, Hollywood film studios and even the British National Health Service. North Korea denies the allegations, saying the accusations are American attempts to tarnish its image.

Zero day: a software bug that allows a hacker to break into your devices and move around undetected. One of the most coveted tools in a spy's arsenal, a zero day has the power to silently spy on your iPhone, dismantle the safety controls at a chemical plant, alter an election and shut down the electric grid (just ask Ukraine). For decades, under cover of classification levels and non-disclosure agreements, the United States government became the world’s dominant hoarder of zero days.

In 2021 cryptocurrency went mainstream. Giant investment funds were buying it, celebrities like Tom Brady endorsed it, and TV ads hailed it as the future of money. Hardly anyone knew how it worked—but why bother with the particulars when everyone was making a fortune from Dogecoin, Shiba Inu, or some other bizarrely named “digital asset”? As he observed this frenzy, investigative reporter Zeke Faux had a nagging question: Was it all just a confidence game of epic proportions? What started as curiosity—with a dash of FOMO—would morph into a two-year globe-spanning quest.