Kapan tells the story of a wealthy man and his family. Süleyman, one of Antalya's wealthiest men, is very devoted to his children. Their lives are turned upside down by the psychological trauma he experiences following the tragic death of his son Tarık's girlfriend. Without informing his family, Süleyman organizes a competition themed "Truth or Dare," with a prize of 100 million dollars but with death as the consequence. In this competition, there is no other way out but to be honest. Aslı, who learns about the competition her father has organized, will uncover the truth and confront her father.