Threatened / Eliot Schrefer.
Luc is an orphan, living in debt slavery in Gabon, until he meets a Professor who claims to be studying chimpanzees, and they head off into the jungle--but when the Professor disappears, Luc has to fend for himself and join forces with the chimps to save their forest.
New York :
Walker Library - Curriculum Collection - Juvenile - 3rd Floor
Pull and Hold