'Don't stray into the Quartermile Field. Any animal with sense avoids the spot,' warns Sammy's mother.

But Sammy is curious - about the Field, and about his father, the fierce, wild father he's never met.

Then one day Sammy discovers that his father has returned. And determined to track him down, Sammy sets off towards the strange, wild land of Quatermile Field - and into a very different and dangerous world . . .