This is the second book and easily as good if not better than the first. the characters in this are gone into in more depth and that pulls you more into the story. There's plenty of action in this and its more realistic than some zombie novels I've read, the characters in this have to struggle not just against the zombies but against a world in ruin, where other humans are a threat and food and other resources are scarce. It seems to me that there should be a third book in the series as there are some loose ends, however I didn't find the end at all disappointing for that and you are left with a good view of how the things that aren't tied up are going to turn out. If you haven't read the first morningstar strain book you should read that first.
UPDATE - Third book showing on Amazon as coming soon WOOHOO!