If your boss gave you a book like that (unless you expressed interest) I would read it and consider it a task assigned to you. If he gave it, I would consider it a warning sign. Also- perhaps if they are busy you can bend your schedule to work a few extra hours at work, or at home, making it clear you are doing this to help everyone get over this busy time. Maybe your fears are based in reality and you need to do something extra. A job that allows this flexibility is worth fighting for.