Mario Portello is run over by a black sedan while sitting at his desk at Ralph's Roller Rink. Josephine Stuart happens to be painting a mural at the rink the day he is rubbed out, making her the only witness to the hit-and-run event. Everyone assumes it's an accident caused by an octogenarian with bi-focal vision and a lead foot. From what Josephine saw, however; she believes the hit was intentionally carried out by a shrewd killer. The police are slow to believe her theory. Mario's family and acquaintances did not like him, but Josephine must look beyond dislike and find someone with a real motive for murder.