The third and final book of The Strain trilogy is...the most disappointing. It's several years after a nuclear winter has enveloped the earth and The Master and his legion of vampires have taken over the planet. All the other ancients were killed when the bombs went off, destroying their points of origin. And what is their origin? The original vampires turn out to be Fallen Angels from heaven. Ugh. This supernatural/religious aspect of this revelation sort of undid the coolness of the first two books.
Eph is sort of a lone gun, back to being an active alcoholic and trying to rescue his son, who has been kidnapped and raised by the Master since the last book. The vampire has been corrupting the youth to get back at Eph and has managed to create quite a sociopath. Fet is now romantically involved with Nora, which takes a turn when she and her alzheimer ridden mother are captured and sent to a blood camp run by the former head of the CDC, who she used to work for. This all reminded me a bit of the last season of FRINGE. It's dark, depressing and some main characters don't make it at the end.