Fay (14) and Boris (10) discover that their parents secretly replaced themselves by robots. Claudia and Joost each have demanding jobs and even though they try very hard, they are not able to combine their jobs with spending quality time with their children. Boris, Fay, Claudia and Joost slowly realize they need each other as a family and when the robots become uncontrollable, they can only clear up the mess by working together.

The story of Dirty Lines starts in 1987's Amsterdam, at a time when Dutch society was changing rapidly. Psychology student Marly Salomon takes on a side job working for a brand new firm: Teledutch - a company started by two brothers, Frank and Ramon Stigter, who established Europe’s first erotic telephone lines. Frank and Ramon become rich overnight and Marly finds herself immersed in this wild and rapid transformation. The final years of the Cold War sparked a sense of hope and inspired a new generation to celebrate life to its fullest. Amsterdam became the center of that cultural revolution with a radically new form of music: house and a new love drug: XTC. The erotic phone lines offer the opportunity to experience anonymous sex in a new way, changing the morality of its consumers, but also very much the people creating it.