Fortune has published an excerpt from senior editor-at-large Adam Lashinsky new book, “Inside Apple: How America’s Most Admired–and Secretive–Company Really Works”:

Apple employees know something big is afoot when the carpenters appear in their office building. New walls are quickly erected. Doors are added and new security protocols put into place. Windows that once were transparent are now frosted. Other rooms have no windows at all. They are called lockdown rooms: No information goes in or out without a reason.The hubbub is disconcerting for employees. Quite likely you have no idea what is going on, and it’s not like you’re going to ask. If it hasn’t been disclosed to you, then it’s literally none of your business.