"Remington Silvertips. Hollowed out." He opened the breech, extracted a cartridge from its nylon loop, and chambered it. "Inside each one, a brachy-therapy capsule. Cancer therapy, localizes the effect on malignant tissue, spares the healthy." He looked at his watch. "They preplant tubes, insert the capsules. Highly radioactive isotopes." He raised the rifle to his shoulder, its barrel out the window now, his back to her. "Cesium, in these," she heard him say.