Tositarinaan perustuva “The Staircase” tutkii Michael Petersonin elämää, hänen suurta pohjoiscarolinalaista perhettään ja hänen vaimonsa, Kathleen Petersonin, epäilyttävää kuolemaa.

Achilleas' wife, Flora, is disappointed by her marriage and remembers nostalgia for her childhood love, Alekos. Fate brings them so they eventually reunite illegally. Alekos's wife, however, Soso understands the illegal relationship and tries to avenge her husband for his infidelity. A series of incredible "crimes" unfolds with our heroes victims.

Ji Eun-Soo is a daughter-in-law of a powerful chaebol family. She suddenly she becomes a murderer, who killed her husband. After she is released from prison, she tries to get her daughter back. She approaches Kang Ji-Min, who has adopted her daughter. He is a cool as ice reporter. Ji Eun-Soo pretends to fall in love with him and attempts to marry him to become the stepmother of her daughter.