Series, series, series...books that is.  Some of the most popular books in the library are in a series.  Students love to follow characters through stories that extend through time.  One of my favorite series in the Guardians of Ga'Hoole books by Kathryn Lasky.  I've recently completed her series called Wolves of the Beyond.  This series follows Faolan's story as he grows from a vulnerable pup to a confident leader.