Millie Bobby Brown is set to release her first novel later this year.The Stranger Things star has written a historical novel inspired by her own family, with Nineteen Steps due for release September 12.“Inspired by my Nanny Ruth, this book is very personal and close to my heart,” said Brown. As reported by The Hollywood Reporter, Brown’s grandmother Ruth survived the Bethnal Green tube disaster.“I grew up listening to stories about her time living through the war.