Not much, as the obvious things like email address/screen name isn't in the book. But as a liveaboard (though I assume a house is no more secure if someone really wants to break in) there's always the possibility that folks could break in.Not a safe thing to travel with that. It's safe if you keep it at home, and in a lockbox when you leave the house or have visitors you wouldn't trust with your life savings. What would happen if that fell into the wrong hands?
But they're usually looking for cash & gear, computers, etc, and I seriously doubt they'd go through the book shelf for that book.