Gr 2-4--In this installment in the series, Sly solves three mysteries. In Case #1, she helps a neighbor figure out why her son's behavior and language patterns have changed and wants to schedule him for an MRI. (It turns out that Brian's babysitter was entertaining him with inappropriate rap music and YouTube.) Next, strange messages mislead Sly's friend Melody into thinking that she has an admirer. It turns out to be a case of mistaken identity and misspellings on the part of an Italian visitor. A subplot involving baseball practice runs through this segment. In the final case, Sly is asked to help the principal interpret graffiti in code in the boys' bathroom. It turns out that the drawings are actually signals that the boys plan to use to beat the girls in a game of baseball. It's unlikely that the intended audience will understand the rap or know about MRIs, and the codes themselves are somewhat weak. Maione sprinkles the text with some expressive line drawings that add some humor to the story, but the book is an additional purchase at best.--Debbie Whitbeck, West Ottawa Public Schools, Holland, MI[Page 84]. Copyright 2008 Reed Business Information.