As the elevation increased, the trees became sparser, scrawnier. She began to see cliffs and snow-covered rock outcroppings.

She kept going: up, down, around, bursting through banks of snow, careening around fallen logs. It took so much concentration, she couldn’t think or feel anything else.

On a hill, the snow machine slid left, lost traction. She eased back on the gas, slowed. Stopped.

Breathing hard through the slits in her neoprene face mask, Leni looked around. Sharp white mountain peaks, blue-white glaciers, black shadows.

She dismounted, shivering. Bracing against the wind, she untied her pack and put on snowshoes, then pushed the snow machine into the limited protection afforded by a large tree and tarped it. This was as far as the vehicle could take her.

The sky overhead was lightening by degrees. Daylight expanded with each breath.

The trail turned upward, narrowed. She saw her first clot of frozen sheep scat within half a mile and followed the hoofprints higher uphill.

She brought out her binoculars and scanned the white landscape around her.

There. A cream-colored Dall sheep with huge curving horns, walking along a high ledge, its hooves dainty on the rough, snowy terrain.

She moved carefully, made her way along the narrow ridge, and hiked up into the trees. There, she found tracks again and followed them to a frozen river.

Fresh scat.

The sheep had crossed the river here, crashing through the ice, splashing through the river. Big chunks of ice poked up, bobbed, held in place by the solid ice around them.

An old tree lay across the ice, its frozen limbs splayed out, water stirring in patches alongside.

Snow swirled across the ice, collecting on one side of the log, fanning away in tiny whirlwinds on the other side. Here and there, the wind had brushed all of the snow away, leaving glistening, cracked patches of silver-blue ice. She knew it was unsafe to cross here, but anywhere else could cost her hours. And who knew if there would even be a good crossing point? She hadn’t come all this way to quit.

Leni tightened her pack and tied down her hunting rifle, took off her snowshoes and tied them to her pack, too.

Staring down at the log, which was about two feet in diameter, its bark peeling away, frozen, covered with snow and ice, she took a deep breath and climbed onto it on all fours.

The world became as narrow as the log, as wide as the river. Rough icy bark bit into her knees. The cracking of the ice was like gunfire exploding around her.

She stared down the barrel of the log.

There. The other shore. That was all she would think about. Not the creaking ice or the frigid water running beneath. Certainly not the idea of falling through.

She crawled forward inch by inch, wind whipping across her, snow peppering her.