What is the fine-grained topic of the following text: With rock music, a broken family, and the crush of first love, Red Velvet Crush explores the complicated relationship of sisters — both the unconditional love and the unavoidable resentments — in a novel full of music, urgency, the first blushes of love, and the undeniable excitement of hitting the road. Only return the topic.
The complicated relationship of sisters in the context of first love, rock music, and a broken family.