Instinct took over. She dropped everything, turned for the steps, and dove straight down like an Olympic swimmer into a pool. A fraction of a second later there was an explosion from overhead, a roar of air and stone. Olivia dodged into a lower hallway a second before the shockwave blasted her forward and collapsed the passage behind her. Early-morning sunlight streamed in from openings above her, but Olivia ignored all that. She kept running, passing through an ancient armory seconds before the weight of the collapsing tower brought it crashing down.