From the author of the Printz Honor Book "Airborn" comes an absorbing novel about a teenage boy whose parents bring home his new baby brother--a chimpanzee. In 1973, when a renowned Canadian behavioral psychologist pursues his latest research project--an experiment to determine whether chimpanzees can acquire advanced language skills--he brings home a baby chimp named Zan and asks his thirteen-year-old son to treat Zan like a little brother.

"Ten-year-old Della can rely on her older sister, Suki, for anything, but when Suki attempts suicide, Della must seek help and speak out about the sexual abuse they've both suffered at the hands of their mother's boyfriend"-- Provided by publisher.