Crossing the foreboding Valley of Forlorn Isotopes, Catherine and her
brothers aid the element guardians in battling sinister isotopes in a life
and death struggle to reach the Palace of Knowledge and the astonishing
gifts it contains. Reaching and discovering the secrets of the palace and
its inhabitants is only the beginning of the children�s journey. For what
is gained in the palace is all but lost in an unfortunate wrong turn into
ancient Greece. Captured by thieves, separated, and sold as slaves, the
children face the evils of humanity and the unforeseen perils of nature.
This 140 plus page book continues the saga of the Adventures of the Elements
book series. It is part of the Accelerated Reader list and teaches about
science through a fantasy adventure. Students from second grade through
high school have enjoyed reading the book.