What is the theme of Criss Cross by Lynne Rae Perkins? Plot Summary? How the characters changed? Please Help!?

Can you please help me with this confusing book? Criss Cross by Lynne Rae Perkins doesn't have a plot and it confused me! I need a character ysis, an important event in the story (any), a plot summary or poem, and the theme of this book. Please PLEASE help me!