How did they find us so fast?

Behind me, the catacombs echo with angry shouts and the screech of metal. My eyes dart to the grinning skulls lining the walls. I think I hear the voices of the dead.

Be swift, be fleet, they seem to hiss. Unless you wish to join our ranks.

"Faster, Laia," my guide says. His armor flashes as he hastens ahead of me through the catacombs. "We'll lose them if we're quick. I know an escape tunnel that leads out of the city. Once we're there, we're safe."

We hear a scrape behind us, and my guide's pale eyes flick past my shoulder. His hand is a gold-brown blur as it flies to the hilt of a scim slung across his back.

A simple movement full of menace. A reminder that he is not just my guide. He is Elias Veturius, heir to one of the Empire's finest families. He is a former Mask - an elite soldier of the Martial Empire. And he is my ally - the only person who can help me save my brother, Darin, from a notorious Martial prison.

In one step, Elias is beside me. In another, he is in front, moving with unnatural grace for someone so big. Together, we peer down the tunnel we just passed through. My pulse thuds in my ears. Any elation I felt at destroying Blackcliff Academy or rescuing Elias from execution vanishes. The Empire hunts us. If it catches us, we die.

Sweat soaks through my shirt, but despite the rank heat of the tunnels, a chill runs across my skin and the hairs on the back of my neck rise. I think I hear a growl, like that of some sly, hungry creature.

Hurry, my instincts scream at me. Get out of here.

"Elias," I whisper, but he brushes a finger against my lips - shh - and tugs a knife free from the half dozen strapped across his chest.

I pull a dagger from my belt and try to hear beyond the clicking of tunnel tarantulas and my own breathing. The prickling sense of being watched fades - replaced by something worse: the smell of pitch and flame; the rise and fall of voices drawing near.

Empire soldiers.