Game Over: A boy is terrorized by video game characters that escape from his TV. Big twist: The boy is himself a character in a video game played by someone else.
Field Ghoul: A boy who isn’t good enough to make the team finds a mummy buried in the football field. It comes to life and terrorizes the school. Big twist: the mummy is great at football. The team makes it to nationals.
Ice Scream: A weird new ice cream truck has been coming around town. Kids who buy ice cream from it mysteriously disappear a few days later. Big twist: It is actually gelato.
Knife and Death: A group of friends discover a cursed knife which kills people when its blade is forced into vital areas of their bodies. Big twist: The kids think they have destroyed the knife, but it turns out there are many others just like it, easily available.
The Scary Owl: A young girl is new in town and she sees a scary owl. Big Twist: The story is an allegory for the horrors of war.
Money in the Bank: That haunted dummy from the one book puts on the haunted mask from the other book and finds that haunted camera what kills people and goes after some kids. Big twist: this all takes place in that haunted mirror from the one book, so the dummy is actually good and the kids are evil.
There is a Monster at the End of this Book: There are some kids and they are all scared of a monster. Big twist: the last page is a mirror; the reader is the monster. Take that, reader!