Perry Mason (1957)

S4E17 The Case of the Wintry Wife

Walter Randall, an inventor, is seeking a divorce from his icy wife, Laura, so he can be with Phyllis Hudson. In retaliation, Laura coerces one of Walter's assistants into constructing a bomb aimed at obliterating his underwater sounding device. While inspecting the bomb in the warehouse, Laura encounters Phyllis and seizes the opportunity to knock her out. Although Phyllis survives the subsequent explosion, she finds herself accused of Laura's murder.