The Passage trilogy is my favourite book series. In fact I'm listening to the first book on Audible which is a completely different experience itself. As far as the TV Series goes - it's fun. I would never have thought to make it that way myself (saw it more on AMC or FX or something) but it's zippy and fast and has its own heart so just sit back, relax, take it for what it is (different to the books) and it will all be ok.
Review of The Passage
