This book came highly recommended by a co-worker. It is the first in a series about a "cleaner" for the CIA, Micah Dalton.
Stone is more a descriptive writer than one that is adept at creating dialogue. The chapters are longer than in most mysteries. Chapter 3 is 78 pages! If the reader enjoys, for example, James Patterson's style of 3 to 4 paragraph chapters, this is not the book to read. However, as far as protagonists go, Micah Dalton can rival popular fictional characters Joe Pike and Jack Reacher, even on his bad days.
Dalton is in a self-imposed celibacy. He is a deadly killer. A loner. He is on assignment investigating the strange death of a good friend and co-worker in Italy. He is exposed to an airborne hallucinogen that results in him having several encounters with the apparition of his dead colleague, Porter Naumann.
Dalton's nemesis is somewhat of an apparition himself. Dalton is traveling the world trying to get his hands on this elusive serial killer, who might be a native American Indian bent on vengeance.
As who-dunits go, this was a good first book. Stone has the knowledge and background for writing these international thrillers since his former career was in military intelligence.