When his friend Leo Pak is arrested on suspicion of murder and armed robbery, Van Shaw journeys to a remote Oregon county to help his fellow Ranger. Van had been Leo's sergeant when they served with the 75th Regiment in Afghanistan, and back in the States, Leo had helped Van when he needed it most. Arriving in the isolated town of Mercy River, Van learns that his troubled friend had planned to join a raucous three-day party that dominates the place for one weekend each year. Attended by hundreds of former and active Rangers, the event is more than just a reunion; it's the central celebration of a growing support network called the Rally, founded and led by a highly decorated Special Operations general named Macomber. But there's more going on in Mercy River than just a bunch of Army hard cases blowing off steam. The murder victim--the owner of a local gun shop where Leo worked part time--was dealing in stolen heroin-grade opiates. Worse, the town has a dark history with a community of white supremacists, growing in strength and threatening to turn Mercy River into their private enclave. The cops have damning evidence linking Leo to the murder, and Van knows that backwaters like Mercy River are notorious for protecting their own. His quest to clear Leo's name will stir up old grudges and dark secrets beneath the surface of this secretive small town, pit his criminal instincts against his loyalties to his brothers in arms, and force him to question his own belief in putting justice above the letter of the law.