A famous mystery writer goes missing at the annual Killer Clause convention and the police dismiss it as a hoax. But when amateur sleuth Becky Robinson uncovers a ransom note written to the tune of a Christmas jingle, she vows to unwrap the truth.

The investigation leads Becky and her pals into a backstabbing fictional world where everyone thinks they can pull off the perfect crime. But all the fun reindeer games come to an end when one of the suspects turns up dead under a Christmas tree.

Can Becky determine who's naughty and who's nice? Or will the cotton-headed ninny muggins strike again?