Italian drama series "Fedeltà" is a story about how even the happiest marriage can sometimes develop cracks. Carlo and Margherita have been together for many years and are still madly in love with each other. But suddenly, their relationship hits a rough patch. Both spouses are plagued by doubts about everything, including their own actions. The couple not only has to make a decision that will impact their future life, but also deal with the consequences of their choice.