This middle grade graphic novel would also work for elementary school. Three girls have to do a school assignment together.  Gwen and Lisa are friends, and Mel is boisterous, daring, and not part of the “friends” group...yet.  Mel is the popular one who doesn’t stop talking about shopping, clothes, shoes, etc.  But when Lulu (Gwen’s sister) is missing, Mel is right there to help find her.  This is a set up story to a longer series about these three girls becoming superheroes, a talking rat, and the scientist sister who is smart but in the hands of an evil professor.  This story was quite fun and I think readers would really like it.  The world building is a bit lacking.  The author glosses over how the girls get their powers.  One minute they are not there, the next they are.  Plus at the end how they become the Rainbow Girls is underdeveloped.  Written like a Rainbow Fairies book for someone much younger.  Overall this book is successful and would find checkouts in libraries, but I hope future volumes have better development.