Fourth Grade Weirdo

Dexter is like a square peg in a round hole: he just can't fit in. All the kids in his class enjoy the zany things their teacher Mr. Ditzwinkle does to make learning fun. All except Dexter, the weirdo who prefers the same routine. But when things start disappearing from school, Dexter is surprised that his teacher is suspected. Dexter thinks Mr. Ditzwinkle is odd, but he knows he's not a crook.
Can Dexter the weirdo prove it by catching the real thief?