"Jesus," Anna breathed as she cleared the last tumble of rock. Iverson was seated on a square block of breakdown the size of a refrigerator. The stone was sheared as neatly as if a gargantuan mason had done it with a chisel. Pieces, varying in size, clung to the edge of the precipice. She scratched her way up to sit gingerly beside Oscar, her hands hooked on the back of their limestone couch lest the pull of the deeps should suck her down. "Shouldn't there be a sign here that reads 'Beyond This Point Be Monsters'?"

"Left goes up to the North Rift," Iverson said. "Right is the main route to the rest of the cave. We go right."

The word "impassable" came to mind. Above, stone vanished into the gloom. Blocks the size of rooms jutted from the walls. Where she and Iverson sat, it was about thirty feet wide, the far side smooth, vertical, offering nothing in the way of an inducement to cross.

"Right?" Anna said.

"Right."

"How?"

Iverson smiled. "There." He painted a curved surface of rock above her with his light. The wall of the rift bulged slightly and bent around in a southwesterly direction. On closer examination, Anna could see where a rope had been strung. The trail-using the term loosely-was suspended along the wall eight or ten feet above where they sat. Pitons, bolts were frowned upon in wild caves. Driving these man-made anchors into living stone left scars. The rope above them made use of a motley assortment of natural anchors: BFRs, Big Fucking Rocks; jug handles, natural holes in the rock; and stalagmites.

Below, the rift fell away in a rugged canyon.