Mr. & Mrs. Smith (2005)

The action opens with John and Jane Smith, a couple who have been married for five or six years, attending marriage counseling. There, they tell the story of their first meeting in Bogotá, Colombia, where they met while both were secretly on the run from Colombian authorities. They quickly fell in love and were married. In reality, however, John and Jane are both skilled assassins working for different firms, each using the marriage as a cover and concealing their true profession from their spouse. When both are assigned to kill a man named Benjamin Danz (AKA "The Tank"), they encounter each other on the job and discover the truth. Both employers task one Smith to eliminate the other, and each must choose between their personal and professional lives.