A young chimpanzee preparing for bedtime learns to say "Yes" when things suit him and "No" when they do not.

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.

When animal behaviorist Guy Schermerhorn demonstrates on a TV game show that he has taught Sam, his juvenile chimp, to speak in sign language, Aimee Villard, an undergraduate at Guy's university, is so taken with the performance that she applies to become his assistant. A romantic and intellectual attachment soon morphs into an interspecies love triangle that pushes hard at the boundaries of consciousness and the question of what we know and how we...