Se devo essere sincera (2004)

In a couple, the ideal is being in three

Adelaide is a 40-year-old literature teacher married with children. One day, she learns about the murder of a wealthy and arrogant co-worker of hers, strangled in her own home. Adelaide meets Gaetano, the charming inspector dealing with the case and decides to help him in the investigation, much to her husband's chagrin.