Without Measure von Scott Blade

Widow must look past the surface of a mass-shooting on a secluded Marine base to see a conspiracy so deep it will leave you breathless. 
Hitchhiking all night. No sleep. Jack Widow stops in a diner in a California mountain town. The town of Hamber has only two industries left: a small arms manufacturer and a forgotten Marine base. 
Wanting to drink coffee in peace, Widow can’t ignore his cop senses warn him about a man, seated at another booth. The man is Arabic, Islamic, and a decorate Marine officer. But, there’s something else. Something off. Something troubling. 
After a failed attempt to talk, Widow departs to find a motel bed, and sleep. But his head never makes the pillow because the local MPs show up, nearly banging down his door. 
Turns out after Widow sat with him, the Marine returned to base and shot five people–dead, before killing himself. Witnesses saw Widow with him. Now, the MPs want to know why a decorated Marine, committed mass murder, moments after speaking to Widow. 
The locals want to blame radical Islam. The politicians want to blame gun culture. The media only care about the headlines. The White House wants nothing to do with it.