Flora, Ruby, Olivia, and Nikki don't understand it. Someone - they don't know who - is leaving books on their doorstep. Each comes with a mysterious message asking them to read the book and do something new. Before they know it, the four friends have a secret, girls-only book club...and are finding out new things about themselves and one another.Who's sending these packages? And what will the next book be? The girls can't wait to find out...