The theme of sisterhood is super powerful in this story, and it's not just about the sisters being all girly and sentimental - although, let's be real, they do have their moments. It's about how they learn to rely on each other, support each other, and lift each other up, even when things get tough. And, trust me, things get really tough - like, angels-and-demons tough.
The sisters also learn about their own individual strengths and weaknesses, and how to use those to help each other out. It's like they're all puzzle pieces that fit together to form a beautiful picture of sisterly love and devotion. And, let me tell you, it's a real tear-jerker at times - I mean, I cried, like, a lot.
