Getting shot in the chest as a rookie ATF agent, bartering for machine guns, throttling down the highway at 100 miles per hour, and responding to a full-scale, bloody riot between the Hells Angels and their rivals, the Mongols - these are just a few of the high-adrenaline experiences Jay Dobyns recounts in this action-packed, hard to imagine, but true story of how he infiltrated the legendary Hells Angels.

Among members of the outlaw motorcycle clubs, Caesar Campbell is a legend. Former sergeant-at-arms and chief enforcer for the Comancheros, Caesar became the founding member and sergeant-at-arms of the Australian chapter of the Bandidos. He epitomised bikie culture - unbeatable in a fight, brutal in the extreme, fearing no one and nothing, and loyal until death. This is Caesar's story, from his recruitment into the Comancheros, to the savage split within the club that led to the foundation of the Bandidos and the bloody massacre at Milperra that resulted from it.

Despite lacking any experience with motorcycle gangs, Charles Falco infiltrated three of America's deadliest biker gangs: the Vagos, Mongols, and Outlaws. In separate investigations that spanned years and coasts, Falco risked his life, suffering a fractured neck and a severely torn shoulder, working deep under cover to bring violent sociopaths to justice.

After 40 years in the Hells Angels, George Christie was ready to retire. As president of the high-profile Ventura charter of the club, he had been the yin to Sonny Barger's yang. Barger was the reckless figurehead and de facto world leader of the Hells Angels. Christie was the negotiator, the spokesman, the thinker, the guy who smoothed things out.

Longtime ATF agent Ken Croke had earned the right to coast to the end of a storied career, having routinely gone undercover to apprehend white supremacists, gun runners, and gang members. But after a chance encounter with an associate of the Pagan Motorcycle Gang created an opening, he transformed himself into “Slam,” a monstrous, axe-handle wielding enforcer whose duty was to protect the leadership “mother club” at all costs.