A paparazzi photographer pursued opera diva Isabella Sommita until her nerves gave out. Therefore, her millionaire patron took her to the island, where she must restore her mental health, and at the same time perform an aria written especially for her by her secret young lover. This place is an ideal setting not only for a performance, but also for a murder: after the premiere, the great singer is found dead with a photograph pinned to her chest. Among the guests present, only Superintendent Roderick Alleyn is able to find out who wanted the death of the prima donna...