Before they heard the noise, the coffee in Harrington's cup began to vibrate. Small ripples formed in the dark liquid. A low, rhythmic tremor moved through the asphalt, rattling the cruiser's windows.

"What the hell is that? An earthquake?" one of the deputies asked, looking around wildly.

Then came the sound. It was a deep, guttural roar that echoed off the mountainsides, a mechanical thunder that grew louder with every passing second.

Over the crest of the two-lane highway, a single headlight appeared. Then two. Then ten. Then fifty.

Harrington stepped out of his cruiser, his jaw dropping.

Rolling into the quiet valley of Mil Haven was a steel river. Six hundred and fifty motorcycles, riding in perfect, disciplined, two-by-two formation. The sun glinted off the chrome exhaust pipes and custom forks. The riders wore heavy leather, their backs adorned with the winged death's head of the Hells Angels. Charters from California, Nevada, Oregon, and Washington had all answered the call.

They didn't speed. They didn't rev their engines aggressively at the police car. They simply rolled past Harrington like an unstoppable force of nature, the sheer volume of their engines drowning out any words the terrified deputy might have tried to speak.

The procession stretched for miles. It took twenty solid minutes for the column to pass the police cruiser. And every single rider was heading for the Last Ride Tavern.

By the time Harrington scrambled into his car and sped back toward town, the gravel parking lot of the Last Ride was overflowing. Motorcycles lined both sides of the highway for a half-mile in either direction. Hundreds of large, intimidating men in leather vests stood quietly outside the tavern. They weren't drinking. They weren't fighting. They were just waiting.

Harrington parked a hundred yards away, terrified to get closer. He slowly unholstered his radio, his hands shaking, but before he could call for state backup, the crowd parted.

Mac, the National President, a giant of a man with a gray beard braided down to his chest, walked out of the tavern's front doors. Beside him walked William Stone Walker, holding a simple ceramic coffee mug.

The six hundred and fifty bikers immediately fell into a dead, absolute silence. The only sound in the valley was the wind whistling through the Montana pines.