Five months after they stopped The Whistler, business is booming for the Undetectables. Just not work that requires magical forensic investigators. So when Diana's ex asks them to solve a murder - her own - Diana, Mallory and Cornelia can't say no.

Going undercover to investigate the set of the TV show, Undead Complex, Diana returns to her life as a propmaker. But even the appearance of a genuine-article Francine Leon dollhouse leaves her feeling pulled down a path of crime-solving she doesn't want to walk forever.

Meanwhile, Theodore's coming apart at the seams - literally - and Mallory is running out of ways to help him. Especially as he seems to be keeping secrets from her.

As the clues - and the bodies - keep piling up, each one making less and less sense, the Undetectables find themselves in a race against time to find out what, exactly, the killer is up to - before the final cut.