At the cemetery, she stood behind a large oak tree about fifty yards from the gravesite, watching through binoculars as the small group gathered around her empty casket. The late afternoon sun cast long shadows across the manicured lawn, and she could hear the priest’s voice carrying on the wind.

Agent Rogers spoke quietly into his earpiece from his position near the cemetery gates. “All units in position. Target is with the family group. We have eyes on you.”

Blair adjusted the small ...