With their invention of bulletproof thermal underwear, the Basmacıgil Family earns the title of the Eighth Family, one of the ruling forces of the world. Yet, as six very different siblings attempt to run the family business, their well-meaning but ineffective efforts leave their father Erol convinced that “no outside enemy is necessary."

When a young woman discovers a long-buried secret about her past, she must trace back a collection of letters to their writers to uncover the truth.