When a holiday decorating contest turns deadly, twin sisters Alex and Hanna trade tinsel and twinkle lights for tracking the twists and turns of a cunning killer.

Alex and Hanna, owners of Murder and Mayhem book and chocolate shop, are hoping for a quiet holiday. That is, after Alex is finished judging the Deck the Halls contest organized by Vanessa, nicknamed “The Dragon.” The whole experience has turned Alex’s usual festive spirit a little grinchy. Instead of inspiring holiday cheer with fun lawn displays, the contest has turned cutthroat, and decorations have started disappearing.

After Alex’s beau, Tom, is seen in a heated argument with the Dragon about his stolen trimmings, Alex finds him dressed as Santa, kneeling over Vanessa’s dead body...with one of his missing candy cane decorations buried in her chest. It’s no surprise he becomes the sheriff’s top suspect.

Alex and Hanna quickly amass a cast of suspects deeper than Santa’s reindeer roster, including an old family friend tasked by their mother with romantic interference; a nosy reporter eager to reveal Alex’s previous murder exploits; and the victim’s psychologist-to-the-stars husband with a spicy secret. But as they try to catch a crafty killer, Alex also grapples with the escalating wrath of Tom’s daughter, and a mysterious psychic dropping cryptic clues, while Hanna deals with her own Christmas crisis.

Murder puts a bitter spin on the twins’ sweet confections and they must find the killer and wrap up the case to keep Santa off the naughty list.