The sequel to the Printz Honor Award-winning "The Monstrumologist." An old friend of Dr. Warthrop's comes asking for help to track down Warthrop's colleague, the sociopathic Dr. John Kearns. At first, Warthrop is reluctant to helpNuntil he learns that Kearns may possess information leading to a creature widely regarded as the Holy Grail of monstrumology.