In fourteenth century London, Crispin Guest is a disgraced knight convicted of treason and stripped of his land, title and his honor. He has become known as the "Tracker"--a man who can find anything, can solve any puzzle and, with the help of his apprentice, Jack Tucker, an orphaned street urchin with a thief 's touch--will do so for a price. But this time, even Crispin is wary of taking on his most recent client. Jacob of Provencal is a Jewish physician...