This was a great series. The ending was definitely unexpected, but perfect. The third book of the series features an apocalyptic world riddled with an ancient plague. I did find myself turning the pages in the 3rd episode, but not with nearly as much compulsion. Also, I didn't find the villain to be all that believable, but he certainly was gruesome enough. Another minor qualm I have with the 3rd book was all the Aussie-isms that the American characters used (tins, poppa, the shops, laneway, pulled a face, air con). Of course, knowing which phrases are absent in an English-speaking population is often more difficult than knowing which phrases are unique to that same population.
All in all, I highly recommend this book to those who like tales of adventure, plague, and apocalypse.