Concept 3 -- Reverse Noir (Building on Ara's McDonald's Comments)

A dame enters a private investigators office. She is entirely professional with him, and has no particular sex appeal. She asks him to investigate her husband's activity, not really fearing that her husband is cheating, just to get to know him better. The investigator learns that the husband spends time away from home because he is involved in charitable undertakings. The investigation leads him to examine the husband's business, which he discovers to be an outstanding corporate citizen. He discovers the existence of several shell corporations, which are in fact philanthropic foundations. Employees of the husband's company catch the investigator snooping around the office, and offer him a tour and a soda. He discloses his findings to the company's board of directors who fire the husband.