A poisoning incident at the Quality Street factory threatens to derail a royal visit and casts suspicion on the factory girls. Reenie Calder, newly promoted and anxious, finds herself at the center of a mystery when a beloved staff member is targeted. With the King and Queen's impending visit to the Mackintosh Factory, Reenie and her friends Mary and Diana must uncover the malicious troublemaker before further harm can occur, navigating the excitement and underlying tensions of their workplace.

The narrative centers on the intriguing premise of a poisoning within a factory setting during a period of heightened excitement due to a royal visit. The plot appears to focus on the interpersonal dynamics and the investigative efforts of the main characters, Reenie, Mary, and Diana. The setting of the Quality Street factory provides a unique backdrop for a mystery that blends workplace drama with suspense. The story seems designed to engage readers with its blend of historical context and a compelling whodunit element.