Carla slowed to a brisk walk as she rounded a corner. Unwilling to risk the elevator, in case the spirit had wiped its programming as well, she entered the first stairwell she found. She climbed eight flights, paused to catch her breath, then emerged onto the tenth floor, which housed a number of office units. Now it was just a matter of working her way to the building’s outermost corridor and finding the skywalk that connected it to the next tower.