My Son Is the Duke's Secret Heir

Seven years ago Nicole was drugged by her fiance and her best friend and left in the wrong room. One night with Duke Kerr Graham and then she vanished, leaving gold coins and a studded earring, never knowing she was pregnant. She returns to Aelphis with a genius son, takes a post as a clerk in Kerr's estate to clear her father's name, and finds the man from that night. He suspects her. She believes him cruel and hides his son.