Captive married woman investigator

Ryoko hides her identity as an investigator and remarries, but her son-in-law Shinichi stubbornly refuses to accept her and ends up running away from home. One day, while trying her best to find Shinichi, Ryoko is ordered to go undercover and accepts the mission, but... Ryoko disguises herself as a secretary and infiltrates the mansion of the Hanaoka-gumi, the masterminds of drug trafficking. However, he ends up having a nightmare reunion with Shinichi there. Ryoko is determined to put herself on the line in order to somehow get Shinichi to wash his hands before he becomes infected with the organization...