"The Heart's Invisible Furies" is a novel by John Boyne that follows the life of Cyril Avery, a gay man growing up in Ireland from the 1940s to the 2010s. The story explores themes of identity, love, and acceptance as Cyril navigates a society that is often hostile to his sexuality. Throughout the book, Cyril encounters various characters who shape his journey, including his birth mother, Cyril's adoptive parents, and friends. The narrative highlights the struggles faced by the LGBTQ+ community in Ireland, reflecting the broader societal changes over the decades.