After clambering amid the mountain peaks, it was almost easy going. Their feet, already hardened by the desert, grew accustomed to the harsh terrain. The nights were cool, but nowhere near as chill as they had been in the heights. After some debate, they gauged it safe to build a brisk fire, which dispelled the worst of the cold; for the rest, they shared their wool cloaks and huddled together, doubling their warmth.

On the morning of the seventh day, they heard a distant roar. Uncle Thulu, leaning on his freshly sharpened digging-stick, turned to Dani with a grin. “That’s it, lad. That’s our river!”

The trail wound through a torturous series of switchbacks, and it was an afternoon’s hard tramping before they reached the source, standing upon a promontory of rock and beholding what lay below.

When they did, Dani gazed at it with awe.

The Spume River burst out of the side of a mountain, plunging in a mighty cascade to the churning riverbed below. At close range, the sound of it was deafening. It was like a living thing, foam-crested and green-thewed, boiling around the boulders that dared disrupt its course. On the edge of the near bank, the barren limbs of a half-fallen spruce tree struggled desperately against the current.

“We’re going to follow that?” Dani asked, agape.

“Aye, lad!” Uncle Thulu widened his nostrils and inhaled deeply. He shouted his reply. “Can’t you smell the taint of it? One way or another, it will lead us to Darkhaven!”

Opening his mouth to respond, Dani gazed past his uncle and paused. Forty yards downriver, hunkered on a ledge, a squat figure was watching them.

At a passing glance, it looked like a boulder, perched and stolid, the color of dull granite; then it flung out one massive arm to point at them, its barrel chest swelled and swelled, increasing vastly in girth, and its mouth gaped to reveal a cavernous gullet.

The roar of a Tordenstem Fjel split the gorge.

Dani’s blood ran cold.

It was a wordless roar, and it echoed between the walls of the gorge, drowning out the sound of the river, impossible though it seemed. Dani clapped both hands over his aching ears, his insides reverberating like a struck gong. His teeth, the very marrow of his bones, vibrated at the cacophonous howl.

“Fjeltroll!” he shouted unnecessarily.

Again the roar sounded, making his innards quiver. And, oh, worse, even worse! On the ridge above it, other heads popped up, silhouetted against the sky; inhuman heads, misshapen and hideous. There were at least a score of them. The sentry repeated its deafening howl and the Fjeltroll began to descend with horrible speed, jamming talons into narrow fissures and swarming down the cliffs.

“Dani!” He could see Uncle Thulu’s mouth shaping his name as he pointed toward the banks of the churning river. “This way!” Without waiting, Thulu plunged downward, slithering through a gap in the rocks.