“Some kids collect baseball cards.  Some collect action figures.  Me?  I collect fractions.”  In this math adventure, our narrator, whose name is never revealed, uses a Reducer (1/2 ray gun and 1/2 calculator) to reduce fractions to their lowest terms, which is needed to help solve the mystery of a stolen, disguised fraction…that he wants for his personal collection.   The Reducer, for example, exposes the fraction 12/20 and discovers that it is still 3/5.  Colorful and comical, animated illustrations add to the zany romp of a story…sure to interest students in any lesson on simplifying fractions.  I would not call this an introduction to simplifying fractions, as a novice may lose the math thread without some prior knowledge about the process, before reading the story.  However, it would make a great formative assessment for kids who have already practiced the simplifying process.  The Back Matter includes one page of explanation on the reduction of fractions.