First I love omnibuses. Not the big red ones in London, the book type compilation of a series or combination of some stand alones. I like them because the save me money and I love them because they often include an entire series and I am one of those freaks of nature that hate starting a series until I own the whole thing.
This is an omnibus containing the original book, Day by Day Armageddon and the follow up, Day by Day Armageddon: Beyond Exile.
These are Zombie genre books. They are presented as hand written entries in a journal of a survivor. The links go to my original reviews.
This book contains a short but again disturbing Zombie tale of twin survivors.
Look for the omnibus it will save you money and perhaps hook you on the Zombie genre.