John Boyne had already penned a clutch of novels when he wrote his first book for young adults. Published in 2006, The Boy In The Striped Pyjamas went on to become a literary phenomenon, selling seven million copies. But behind that remarkable success lies a very different kind of life story. Now, with the publication of his latest novel, The Heart’s Invisible Furies, the best-selling writer feels that he can talk honestly and openly about his past: about growing up in Ireland, his sexuality, the break-down of his civil partnership, depression, drinking and a lot more besides.