Ben Tomlin has been an only child for thirteen years. So when his research-scientist parents bring home a baby chimp to raise as a human child, Ben's life is turned upside-down. Teaching a baby chimp how to understand language is not his idea of fun, especially when he's trying to settle in at his new school.

But it isn't long before Zan's infectious personality endears him to everyone and he becomes a real member of the family. But just what will happen when he grows up and the experiment comes to an end? Ben must take dramatic steps, and the repercussions ricochet through his home and community with devastating results.

This phenomenal novel is a thought-provoking story of relationships and family, first love, growing up, ethics and dilemmas.

Half Brother isn’t just a story about a boy and a chimp. It's about the way families are made, the way humanity is judged, the way easy choices become hard ones, and how you can't always do right by the people and animals you love. In the hands of master storyteller Kenneth Oppel, it’s a novel you won’t soon forget.