Peter Nimble and His Fantastic Eyes by Jonathan Auxier

From the publisher: "Now, for those of you who know anything about blind children, you are aware that they make the very best thieves. As you can well imagine, blind children have incredible senses of smell, and they can tell what lies behind a locked door- be it fine cloth, gold, or peanut brittle- at fifty paces. Moreover, their fingers are so small and nimble that they can slip right through keyholes, and their ears so keen that they can hear the faint clicks and clacks of every moving part inside even the most complicated lock. Of course, the age of great thievery has long since passed;today there are few child-thieves left, blind or otherwise. At one time, however, the world was simply thick with them. This is the story of the greatest thief who ever lived. His name, as you've probably guessed, is Peter Nimble."