It’s 1941 during the Second World War. While everyone else seems to be evacuated to the countryside, 12-year-old Joseph is sent from rural Yorkshire to stay with his gran’s friend, Mrs F, in the city. She’s a gruff, unfriendly woman and he’s an angry boy who kicks out at everything and feels totally abandoned.

Now Joseph also finds himself in the centre of the Blitz, where bombs rain down every night. The only thing Mrs F cares about is the rundown zoo that she owns, and particularly a huge silverback gorilla called Adonis. Adonis and Joseph at first seem to take an immediate dislike to each other but over the course of the story, their bonds deepen to a remarkable relationship.