Devil in the Details by Greg Vigdor

A secret powerful enough to kill for — and a system corrupt enough to hide it.
Health policy detective Irv Tinsley has spent his career uncovering fraud and greed in America’s health-care system. But when he opposes the hostile takeover of a struggling rural hospital in the Pacific Northwest, he discovers a conspiracy far more dangerous than a corporate grab for money.
The hospital is underfunded and barely surviving. A powerful venture capital firm wants full control, and those standing in its way face increasing pressure to fall in line.
Then people start dying.
As Irv digs deeper, he uncovers a violent history buried within the remote community, and a connection to a secret organization with ambitions extending to the highest levels of American government.
The closer Irv gets to the truth, the more dangerous — and personal — his investigation becomes. He must unravel the conspiracy before the hospital falls, more lives are lost, and a hidden plan for national conquest becomes impossible to stop.