What's the Name of That Book??? discussion

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The Program
SOLVED: Children's/YA
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SOLVED. Book with a cover in which a boy and a girl in yellow clothes are looking at each other in a white background. [s]
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most likely this book takes place in a modern/dystopian society with an illness/disease they need to take care of, the people on the cover try to figure out the problem/secrets. The title starts with the word "the"