Grace Byrne is the daughter of Michael Byrne and Sian Diamond. She also has a twin sister Megan who Grace is thick as thieves with. Sian walked out on Grace and Megan years ago. When Grace starts Waterloo road. She catches the attention of the joint head, along with her father Max Tyler. Grace decides that she wanted him. She knows how much it would annoy her father. Before long, Grace and Max are sleeping together but they have to keep it hidden. But when Grace learns she's having Max's baby, it all changes especially with Michael wanting answers and the truth of her parents affair about to come out.