I'll be honest, although I love Supernatural, until now the tie-in novels have left me cold. Poor characterizations, ridiculous plots and awful secondary characters have pretty much ruined them for me. That all came to an end with John Passarella's Night Terrors.
Night Terrors starts off with a bang-we're dropped right into the action and it never slows down. From giant tarantulas to Nazi zombies to killer trees, Sam and Dean are literally up against the stuff of nightmares. And gruesome ones at that--trust me, the tarantula scene is exceptionally graphic. The MOTW is interesting and one not often seen, which makes it fun trying to guess what it could be. I especially like that the hunt fits in easily with the show's timeline--no glaring canon errors, or events so big that they should have impacted the series.
The best part of the novel, tho, is that Mr. Passarella knows his stuff when it comes to Supernatural. He is a longtime fan of the show and it shows clearly in his characterizations of Sam and Dean and in their interactions with each other and everyone around them. He works in references to recent events in the show such as Sam's return from Hell and his fear of returning to Soulless!Sam as well as Dean's tendency to repress, repress, repress--little things that make the characters recognizable and believable and that have been sorely lacking until now.
Night Terrors by John Passarella is by far the best Supernatural novel I've read. I highly recommend it to any and all fans of the show and I hope that we see more from Mr. Passarella in the future!