It's busy days for Mitsuko, Japan's first female detective, and her assistant Saku, heir to Yoshida Department Store, as they rush around town trying to capture a messenger pigeon and deliver it to the newspaper! The photos the pigeon was carrying are valuable, and potentially explosive, but the detectives dare not heed the warning to mind their own business. Trouble is their business, and trouble's on the way, in the form of fraught mother-daughter relationships, media power, and even an earthquake!