"Naughty or Knife" is 4th book in the museum of mysteries series. The series centers around Scarlet McCormick, the new head curator of the Reed Museum in California. In this story, as usual, she is having problems at work. She is putting on the annual Christmas holiday event for children, and she seems to be messing it up. A lady college professor volunteers to be Mrs. Claus and Scarlet agreed, but this displeases the man playing Santa. On the night of the gala Mrs. Claus disappears and a search discovers her dead body in a wing of the museum with the Santa holding a knife. After "Santa" explains he just found her on the floor, it appears she may have been killed by a thief who was breaking into an exhibit. However, later they discover the lady was poisoned. As usual, Scarlet involves herself in the investigation with the help of her FBI friend. Scarlet isn't a Poirot, she seldom actually discovers who did it until the killer reveals themselves trying to kill Scarlet. That was the case here. I actually like this plot device; it doesn't make us feel so stupid. The plot was interesting, the suspects were quirky but interesting, and the regular characters (Allie, Winnie, Luke etc.) were enjoyable. I rate it a four for what it is, a fun cozy murder mystery with familiar characters and settings. This would make a good Hallmark Mystery series if that channel was still producing new mystery shows. A fun read.