Why had she gone in there? It seemed like incredibly bad luck to have wandered into a cave hidden from the sun’s rays.

Unless she had somehow been coaxed into coming here…

Rex pulled his gloves on. These days the touch of stainless steel made his bare flesh itch during the secret hour, but leather gloves allowed him a solid grip on his new weapon. Dess had decorated the hunting knife’s blade with a super-fine guitar string wound in patterns that made his eyes burn and water. The knife had the clever human smell of a finely tooled bicycle part—all modern alloys and precise proportions—buzzing with a thousand ingenious angles.

It make his head hurt to look at it, even to think its name, which meant that the weapon could fend off any darkling, at least for the short time it would take for Jessica and Jonathan to get here. The secret hour had begun almost three minutes ago—they had to be on their way.

From just outside the mouth of the fissure, he stared into the gloom. A blue glow emanated from the rocks, revealing layers of slither Focus in the cave, plus one slender trail of human footsteps. The crevice went deeper than he’d thought, the Oklahoma shale crumpled into zigzags by some ancient earthquake.

He paused to listen. The short, raspy breaths of a panicking thirteen-year-old reached his ears.

“Cassie?” he called.

The breathing caught, then a voice answered softly, “Help me.”

The girl sounded much younger than thirteen; probably she was frightened out of her wits. “Are you okay?”

“My grandma froze.”

“She’s better now, Cassie,” he said calmly. “But she’s worried about you. Are you all right?”

“It hurts.”

“What hurts, Cassie?”

“My foot. Where the kitty bit me.”

A cat. Rex remembered the slither that Jessica had followed on the first night the darklings had tried to kill her. It had disguised itself as a black cat and scratched on her window, then led her out onto Bixby’s empty streets to where a darkling awaited. They must have used the same trick on Cassie Flinders. With the whole world transformed into a frozen, empty place around her, she had innocently followed the only other living creature she could see.

“It’s okay, Cassie. My name’s Rex. I’m here to take you home.”

She didn’t answer.

“Cassie, you have to tell me: is there anything else in there? Anything besides the kitty?”

“It went away.”

“That’s good.” The slither must have struck as the eclipse had ended, just before heading back to its burrow. It had hobbled Cassie to make sure she didn’t wander out of the cave, out to where the sunlight would free her from the blue time. Cassie had been frozen for the fifteen hours since the eclipse—to her the cat had only run off a few minutes ago.

“But there are snakes in here, Rex,” Cassie said. “They’re looking at me.”

He tried to ignore the fear in her voice, the way it made him react. He could tell from her breathing that she was sick and remembered from the news that she’d been home from school with a head cold. Easy prey.