When the costume for the school's mascot is destroyed, the members of Club CSI are determined to find the culprit before anyone else can solve the case.

Hope Roberts is a confident eleven-year-old girl who plans to be an astrophysicist, and who loves swimming, Galaxy Girl comic books, her best friend Sam, and her two rescue dogs (not necessarily in that order); but then she starts middle school, and suddenly she cannot seem to do anything right--even science club is a problem because she and another girl, Camilla, get stuck with the boring part of the science project that they suggested, but Hope...