Lockdown: Escape from Furnace, by Alexander Gordon Smith

The figure stalked like a bird, taking huge, sweeping steps forward, its legs lost in the tails of its leather coat. The body seemed to twitch and shake as it progressed, the head jerking upward every five or six steps, the gloved hands clawing at its own face as if trying to remove the ancient gas mask that hung there. There was something very wrong with the way it moved its limbs, but the heavy crimson light stopped me working out what it was.