3.5 stars actually for Maddy and Olly. To be honest, I kind of wished I got hooked into Maddy's sickness more but I felt like majority of her thoughts revolved around Olly and how Maddy's sickness is getting in between them. Not that I did not like their love story--I loved it actually. It was sweet, funny, bit cheesy, and swoon-worthy as well. But I guess I just wanted to get a deeper (and darker, 'cause I'm a sucker for those) feel of the struggles that her sickness has brought upon her. After the twist at the end, I was just, "oh, okay. That's nice." I wasn't as affected as I thought--hoped--I would be. Felt like it was the easy way out for the author. I also wanted to get to know more about the other characters; Kara, Olly's mom, Maddy's mom while she was undergoing therapy, etc. I felt like the ending was a little bit rushed. 
 Still, 3.5 stars because even though I enjoyed majority of the book, I just couldn't overlook that twist. Would have been 4 stars from me (5 even) if there had been a different and more realistic outcome.