Francis Aloysius Finn, owner of the A-Plus Detectives Agency & Famous Detectives School, gets more than he bargained for when Norris Beamer asks Finn to investigate his father's death. Is Viola, Beamer's new step-mother, really a black widow, or did her four elderly husbands die of natural causes? Is one of her neighbors involved? Or her boss? Or someone else...

With the help of his Famous Detectives School students and Hilary Kendrake, his temporary secretary, Finn uncovers a deadly scheme of drug-dealing and murder-but will one of them be another victim?