There are 4 books in the Ape Quartet series. The newest book is Orphaned which came out in 2018.

1
Endangered

Book cover of Endangered
From National Book Award Finalist Eliot Schrefer comes the compelling tale of a girl who must save a group of bonobos -- and herself -- from a violent coup.

Congo is a dangerous place, even for people who are trying to do good.When Sophie has to visit her mother at…
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2
Threatened

Book cover of Threatened
*A 2014 NATIONAL BOOK AWARD FINALIST*

When he was a boy, Luc's mother would warn him about the "mock men" living in the trees by their home -- chimpanzees whose cries would fill the night.Luc is older now, his mother gone. He lives in a house of mistreated orphans, barely…

3
Rescued

Book cover of Rescued
Raja has been raised in captivity. Not behind the bars of a zoo, but within the confines of an American home. He was stolen when he was young to be someone's pet. Now he's grown up . . . and is about to be sent away again, to a place…

4
Orphaned

Book cover of Orphaned
In National Book Award finalist Endangered, Eliot Schrefer showed a human's first encounter with an ape. Now comes this astonishing story of a family of gorillas' first encounter with a human.

Before humans, and before human history, there were the apes.Snub is a young gorilla, living in the heart of…