When the mysterious hotline rings, how much are you willing to pay to complete the mission? The series is adapted from Matthew Quick's novel of the same name. At the end of the first season, FBI grassroots agent Peter Sutherland (Gabriel Basso) made a great contribution by saving the president. In this season, he will officially become a member of the Dark Night Operation. However, joining this top-secret organization also means plunging into a world full of dangers and intrigues.