
Here's a book I think you'll like.
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Backstory- A wicked flu virus outgunning anything Ebola ever did broke out and killed of most of the Earth's human population. Those who haven't contracted the virus band together in remote and primative places, ready to shoot anyone who comes near because they might bring the flu with them. A few of the sick survive and are used for various things until the resist and band together too. One group of Survivors is called the Kinka and they've developed their own religion, believing themselves to be divinely chosen to ensure survival of the species. They recruit new members by infecting healthy people on purpose. If these people survive, they're forced to join the Kinka. The Survivors lose all their hair, most of their senses (such as hearing,) and sometimes part or all of their sanity.
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Ceej (pet form of C.J.) lives next to the Grand Canyon with his uncle and sister, Harryette. The sister is a Survivor. She has no hair and can't speak or hear. She's lost part of her sanity, but has developed another clarity of thinking. She loves and is loyal to her brother. Tim is Ceej's best friend and he thinks Harryette is beautiful, like Sigourney Weaver in ALIEN. Time likes old movies a lot. There's another person who lives in the Canyon whom they call the Phantom. They've seen her briefly on several occasions and once she found Ceej's mule after it got lost.
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One day, Ceej's uncle and Tim's dad drive up to the dam above the Canyon because it's about to overflow or break apart, which would be very bad for their water supply. They plan to release the sleuces so water can escape without destroying everything. When they're late in returning, Ceej and Tim suspect they've been nabbed by the Kinka.
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Ceej and Tim set out on their mules to find their uncle and dad. Along the way, Tim is bit by a snake and saved by the Phantom, who turns out to be a Native American girl, the last Hopi on Earth. Her name is Isabella and she saves his life with traditional medicine. She explains she's on her way to her people's most holy place, Sipapuni (a real place, by the way), where she believes she'll be transported to a different world, safe from the Flu. In the meantime, she believes her deceased grandfather is guiding her to help them.
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Ceej, Tim, and Isabella travel on. Ceej and Isabella fall in love along the way and this part of the story is also done very well. They're both about sixteen years old, among the only survivors on Earth, clinging to hope, and going on faith. Ceej comes to believe Isabella's claim that the Sipapuni can save them, while Tim remains skeptical.
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When they catch up with the Kinka, they discover Harryette has also been taken. Tim is frantic to get her back. He sees Harryette in a window and uses sign language to communicate with her. Harryette tells him to go away because she's afraid he'll the Kinka will kill him with the Flu or by other means. Of course, Ceej and Tim won't abandon her or the hope that their uncle and father are also being held. After observing the Kinka's movements, they also realize that Kinka children are born healthy, having inherited complete immunity from their Survivor parents. These children are the future of humanity.
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Harryette has a strong belief in her own life's purpose. She decides to help Ceej and Tim get their loved ones back, whether they like it or not, setting off climactic events.
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The whole journey through the Grand Canyon, observing the Kinkas, and planning how to rescue their loved ones was so intelligent and respectful of the potential real teenagers have and too many adults overlook. The romance was done well too, taking into consideration how much these young people need each other to survive, and how humanity needs them to fall in love, pair-bond, and procreate. The characters are original, multi-dimensional, and beautifully flawed. The interpersonal dynamics were spot-on.
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This book was released in 2007 and can be found in paperback and hardback. Cover art varies. I found mine at the local library.