She groped her way down into the darkness. It smelled of damp and stagnant water. What was she doing? What was she thinking? She gritted her teeth and set her hand beside Selden’s. The result was astonishing. A sudden bar of light shot out from beneath her fingers. It ran the length of the tunnel in front of them before vanishing around a curve. Along the way, it arched over doorways. In some places, runes shone on it. She froze in astonishment.