You don't need a book to tell you this much: Sometimes things fall apart, crack open, and miss the mark. You can plan and strategize and keep your eye on the horizon, watching for trouble. And nothing you can do will protect you from the fact that things might, when you least expect it, go terribly, horribly wrong. If you're anxious about this, it's not like you don't have a reason. If you're very anxious about this, you're certainly not alone.