When an opera singer discovers her lover murdered at a clandestine rendezvous, she finds herself entangled in a high-stakes investigation alongside an enigmatic artist. Tina Rossi, a performer caught in the crosshairs of a lethal conspiracy, must navigate the dangerous intersection of scientific research and international intrigue. She relies on the assistance of Johnson Johnson, a painter who operates as an amateur detective, to decipher the motives behind the scientist's death. The narrative follows a traditional mystery framework, utilizing a blend of suspense and character-driven investigation to uncover hidden agendas.

Readers frequently highlight the distinctive voice of the author, noting the sophisticated prose and the intricate plotting that defines the series. Discussion often centers on the character of Johnson Johnson, whose unconventional methods and artistic background provide a unique lens for the investigation. Critics often point to the balance between the glamorous world of opera and the clinical precision of scientific research as a key stylistic element. The pacing is generally described as deliberate, allowing for careful character development alongside the unfolding mystery. Many readers appreciate the atmospheric detail and the clever construction of the puzzle, which remains a hallmark of the series.