The Haunted Library: The Ghost in the Attic

This is a fun beginning-chapter-book series by Dori Hillestad Butler that I will soon be adding to our collection.  Claire lives upstairs in a library with her grandmother, the librarian, and her parents.  She is able to see and talk to the ghosts that live there.  Each book is a mystery that she and her ghost friend, Kaz, need to solve.  In  this one, a neighbor thinks she has a ghost in her attic and Claire and Kaz take the case.   But an overarching problem in all the books is for Kaz to find his ghost family that he was separated from.  (E BUT)