The Fault in Our Stars by John Green
Despite the tumor-shrinking medical miracle that has brought her a few years, Hazel has never been anything but terminal, her final chapter inscribed upon diagnosis. But when a gorgeous plot twist named Augustus Waters suddenly appears at Cancer Kid Support, Hazel's story is about to be completely rewritten.
Insightful and breathtaking! This honest look at life and death is a must-must-must read. Prepare for a well worth it pool of tears.