The Fault in Our Stars is a heart-wrenching love novel written by John Green. It follows the story of Hazel Grace Lancaster, a teenage girl with cancer, who meets and falls in love with Augustus Waters, a fellow cancer patient. Together, they navigate the challenges of their illnesses while experiencing the joys and sorrows of first love. The novel explores themes of love, mortality, and the meaning of life. With its raw emotion and honest portrayal of teenage love, The Fault in Our Stars has become a beloved bestseller.