Cold Kill — James Becker

  This “brilliantly constructed thriller” features an English policeman investigating a serial killer alongside the FBI in the American southwest (Robert Foster, author of The Lunar Code).
 
When mutilated cattle are found in New Mexico, it's only a matter of time before the killer will seek out human victims. And when a series of eviscerated corpses appear on the prairie, British detective Steven Hunter, seconded to the FBI, is assigned the task of finding the twisted murderer.

But his investigations pull in two conflicting directions. Who is piloting the mysterious jet-black helicopters that have been spotted flying over the crime scenes? And do they have anything to do with the killings?
With no forensic evidence left on the bodies, and a series of loner victims with nothing to connect them, these cold kills will stretch Hunter to his limits if he hopes to stop this predator from finding his next prey . . .