The Invasion of Crooked Oak (Paperback)

Nancy's parents are acting weird. Their eyes are blank, they won't eat - it's like they're no longer themselves. Pete and Krish are obsessed with unexplained phenomena and when they offer to help Nancy investigate, they're sure they can crack the case. But the deeper the trio dig, the darker the mystery gets ... Crooked Oak is under attack from a dangerous foe, and they're the only ones who can stop it.