John B. Miller 
Circumstantial Murder [EPUB ebook] 

An average day turns into a maelstrom of confusion when a city trash truck hits a medical supply expert shortly after breakfast. A body turns up in a public park minus part of his skull and all of his brain. Strange people start showing up and relating unusual tales of intrigue that span three continents and cover the spectrum from mid-twentieth-century technology to the archaic times of cannibalism and headhunting. It also becomes apparent that no one is what they say they are.