Rain pelted the black waters of Cedar Lake as Alexander and Stefan crouched in the underbrush. The angry sky rumbled above them, lightning flashing in the distance. Through night-vision goggles, Alexander scanned the cabin that held Camille.

What had once been a rustic family retreat now resembled a fortress. Motion sensors dotted the tree line. Cameras swept the property in careful arcs. Two men with rifles patrolled the perimeter, their movements precise and ...