The secret commonwealth

Lyra Silvertongue's adventures in the North are long over--the windows between the many worlds have been sealed, and her beloved Will is lost to her. She does still have the alethiometer: the truth-telling device given to her by the master of Jordan College, which guided her journey. Lyra doesn't know the full story of the alethiometer, though. Or the role that young Malcolm Polstead played in bringing both the instrument and baby Lyra to Jordan....