The first book is called Day by Day Armageddon, and it’s by J.L. Bourne. It is in journal form written by a naval officer as the world gets taken over by zombies. The book goes on chronicle his by by day survival and the people he meets along the way. What was kind of interesting about this book is the main character is smart and extremely capable, so there isn’t a whole lot of scenes that leave you scratching your head wondering why he is doing something stupid. There is no explanation as to why the zombies exist, similar to the Walking Dead. In fact, the world where this novel exists is pretty much the same world in which the show Walking Dead exists, except this novel takes places as civilization is falling, not after.
The second book is Called Plague of the Dead: The Morning Star Strain by Z.A. Reicht. In this book the zombies are caused by a virus that spreads by bite. Infected people go crazy biting others until they die. After they die, and this is kind of a spoiler, the virus reanimates the body and continues its biting spree. This book is told from the perspective of several people from various parts of the world, and although I have not finished the book yet, seems to primarily take place as humanity is combating the infected/zombies, rather then just surviving. Something that is better in the book than in any movie I have seen yet, is the sheer scope of what is happening. In this book there are actual battles between the military and entire cities of the undead. I’ve never seen anything like that in the movies. It would be great to see this book made into a movie with Lord of Rings level cgi battles, but I doubt that will happen.