A visit to the one person sure to instil terror into Daisy's heart turns out to be even worse than expected when she discovers her dentist, Raymond Talmadge, slumped dead in his patients' chair, a nitrous oxide mask clamped to his smiling face. Although rumoured to be a secret dope fiend, Daisy and her husband, Chief Inspector Alec Fletcher, are sure he was murdered. Suspects abound - the devastatingly handsome Talmadge didn't need laughing gas to make his female patients swoon. And with scandals surfacing in a case that grows more tangled by the day, Daisy and Alec face their most perplexing mystery yet!