Vivian Ellis should not have been on the northern ridge that night. The storm had already forced Blackwood National Park to close its trails, but a fallen tree had damaged an emergency radio tower. Vivian and another ranger were checking the area when the sky suddenly flashed white. A deafening crack followed almost at once.
Lightning struck the enormous granite boulder beside the trail. Vivian threw herself down as fragments of rock flew across the clearing. The smell of smoke and scorched earth filled the air. When she looked up, the boulder she had passed hundreds of times was split almost cleanly in two. One half had shifted several feet down the slope.
“Vivian, are you okay?” her radio crackled. She barely heard it. Something beneath the broken rock had caught her attention. Through the rain and smoke, she could see a dark opening where solid stone had been before. Inside, there was a row of fitted stones that clearly had not formed naturally. Then her flashlight caught something behind them…