Set of two novels by Kristin Hannah: 'Firefly Lane' and 'Fly Away'. "Firefly Lane" is a coming-of-age story about two inseparable best friends, Tully and Kate, from their teens to their forties. "Fly Away" is the sequel, focusing on the aftermath of "Firefly Lane" and how the characters cope with their grief.  Both books are available as a set, The series has also been adapted into a popular Netflix series, also titled "Firefly Lane," which incorporates elements from both books.