The first book I finished reading in 2016 is Chimera by Mira Grant (pen name of Seanan McGuire). It was the third and final book in the Parasitology trilogy.
The main character is Sal, formerly Sally, who had been in a terrible car accident. A medical tapeworm was implanted to try to save her. Sally was actually gone, and the person known as Sal was the tapeworm driving the body. This is actually a minor spoiler from the first book. As the series continues, the tapeworms start to take over more bodies, but unlike the success that is Sal, they are more like The Walking Dead. The series tackles what is a person, as well as different concepts of identity.
I enjoined the series including this final book. If you have not read Mira (or Seanan) I would recommend the Newsflesh trilogy by Mira Grant. It is fantastic. I also very highly recommend Imdexing, which she released under Seanan McGuire.