Augustus and Hazel meet at cancer support groupand were instantly very interested in eachother so they start hanging out and talking often.
Hazel and Augustus keep getting closer and struggle to ignore strong feelings which are forming. They also help their mutual friend Isaac through a surgery which makes him fully blind.
Augustus uses his wish wish to go to Amsterdam with Hazel to meet the author of a book who turns out to be an alcoholic. However when they're there they give in to their feelings for eachother and decide to give it a chance.
When they get back Augustus gets very sick as he gets cancer in his leg and it causes him to be miserable but Hazel is constantly with him supporting him as he becomes a lot sicker than her.
Augustus ends up dying of the cancer and Hazel has trouble coping with it. However, after a while she manages to come to terms with it and she finds a letter that he wrote her before he passed.