Minami (Masaharu Fukuyama) accompanies Shintaro (Yo Oizumi) in visiting his parent’s grave. At the same time, the skeletal remains of an old person is found at the wharf and Sakura’s (Yo Yoshida) team arrives. The body is of a wealthy man that has gone missing 3 years ago. At the time, the suspect was his 40 years younger wife, Arisa Kasai. On top of that, she has married men with large age gaps who has gone missing after their divorce in the past. Plus, she is suspected of being a spy from the American embassy.

Minami and Shintaro go to interrogate Arisa, but Minami gives an unexpected reaction. He becomes fond of Arisa and states that she isn’t the culprit.

Will the case be solved?