Angelfall by Susan Ee
In a post-apocalyptic world where angels have descended to Earth and unleashed destruction, a resilient teenage girl embarks on a perilous journey to rescue her kidnapped younger sister. With society in ruins and danger at every turn, she allies with a mysterious angel whose motives are unclear, navigating a landscape filled with roving gangs, gruesome creatures, and celestial warriors. As she fights to survive and uncover the truth behind the invasion, she confronts the blurred lines between good and evil, and the potential darkness within herself and her enigmatic companion.