Fourth Horseman

Wilderness Patrol fficer Pamela Tate, scouting in the mountains of Washington, sees and touches a ground squirrel in the dusty path, blood trickling from its mouth. Forty-eight hours later she lies dead at her campsite, covered in mysterious welts and bruises.

Across the lake, a boisterous camping party falls silent as they watch each other sicken and die in agony.

A killer is loose. It has a foreig...