This book was a much, much faster read than 1Q84. It helps that it was YA and only took me 3 days to read. It is about Hazel, a 16 year old who lives with lung cancer, who meets Gus in a cancer support group for teens. Gus is missing part of one of his legs from cancer, but has been cancer-free for a while. They immediately click, but Hazel worries about Gus being more interested in her than she is with him, but eventually that worry is resolved. She introduces him to her favorite book (that ends mid-sentence) and Gus to his favorite book (which is part of a series that she breezes through). Through this, they create a budding romantic relationship. Hazel tells Gus about the times she has written to the author of her favorite book, and he also writes to him, but emails it (rather than snail mails it). He ends up getting a response--amazingly!--and the author invites them to visit him in Amsterdam. Gus then informs Hazel that he had not used his Wish (she had already to go to Disney), so they will go to see the author! During their time in Amsterdam, their relationship deepens and they found that the author was not quite how they pictured him would be. Also, Gus revealed a secret to Hazel that changes their relationship forever.