The family that captured the world's imagination

When 'Wuthering Heights' by Emily Brontë was published in 1848, one reviewer wrote:

... the reader is shocked, disgusted, almost sickened by details of cruelty, inhumanity, and the most diabolical hate and vengeance, and anon come passages of powerful testimony to the supreme power of love—even over demons in the human form.

It was one of the most astonishing reviews in English literary history. Nothing like it had ever been published before and nothing has since.

How did three sisters, daughters of a country clergyman, grow up to produce some of the most powerful and dramatic novels in the English language?