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.

Twenty-two years in the FBI, 16 of them as a member of the Bureau's Behavioral Science Unit. Roy Hazelwood, like many investigators, has seen it all. But unlike most, he's gone further into the dark and twisted psyches of serial killers and sadistic sexual offenders and has emerged as one of the world's foremost experts on the sexual criminal. Acclaimed true-crime writer Stephen G. Michaud takes you into the heart of Hazelwood's work through dozens of startling cases, including those of the Lonely Heart Killer, the "Ken and Barbie" killings, and the Atlanta Child Murders.

In the number-one New York Times best seller Mindhunter, John Douglas, who headed the FBI's elite Investigative Support Unit, told the story of his brilliant and terrifying career tracking down some of the most heinous criminals in history. Now, in Journey into Darkness, Douglas profiles vicious serial killers, rapists, and child molesters. He is straightforward, blunt, often irreverent, and outspoken, but takes pains not to glorify any of these murderers.

The dead talk - to the right listener. They can tell us all about themselves: where they came from, how they lived, how they died, and, of course, who killed them. Forensic scientists can unlock the mysteries of the past and help serve justice using the messages left by a corpse, a crime scene, or the faintest of human traces.

Face-to-face with some of America's most terrifying killers, FBI veteran and ex-Army CID colonel Robert Ressler learned from them how to identify the unknown monsters who walk among us - and put them behind bars. Now the man who coined the phrase "serial killer" and advised Thomas Harris on The Silence of the Lambs shows how he has tracked down some of the nation's most brutal murderers. Join Ressler as he takes you on the hunt for America's most dangerous psychopaths. It is a terrifying journey you will not forget.