Agatha-Josephine and Nicky Charle suspect their school janitor is murdering all of the women he takes down to the cellar at their high school. Especially, after they find the corpse of an unrecognizable woman in the furnace burnt to a crisp. This leads the two of them on a campaign to solve the crime before her grandfather Bill Gannon a retired detective, Joe Friday (special agent), and the local police.

Agatha-Josephine Friday Noonsday and Nicky Charle, Amateur Sleuths, are high school students in Woodinville, Washington. These two amateur sleuths are thrown into a murder investigation and the calamities of others by being in the wrong place at the right time. Agatha-Josephine expects everything to come out OK. Unless, her suspicions of events surrounding her and Nicky's discoveries leading to murder get the best of her imagination.