273 Survey

Jimmy rested for a night and drove straight to the Big Bend National Park. After coordinating with the park police, they led him to a cave.

All the skeletons in the cave had already been removed, but the cave had been sealed off since the discovery of the remains, so the traces inside were not too badly disturbed. White lines marked the ground and the cave walls, and the bullet holes found on the walls had been preserved intact. The police had only removed some bullet fragments from inside, and as Roland had said, these fragments couldn't be traced back to any specific source, nor were any fingerprints or similar traces found.

The first investigation Jimmy undertook was ballistic trajectory analysis. Bullets had been found on the bodies, and bullet holes were on the cave walls, so figuring out the ballistic trajectory was essential for determining the gunman's path.