Book 4 of the Animorphs Chronicles (Book 47.5). This follows that strange creature that touches the storyline at various times. We learn his history and struggles. In the end the theme is best summed up by the final words. Did my life matter? I love this as a deep premise and gives us all pause to think about what we are doing and where we are going. I enjoyed this as an end to the series and a culmination of the completed story. Hope you make the time to read this one.