Katrina Black, or as mentioned in the book, Kate Black happened to be Regulus Black and Cassandra Dawson's only daughter who lives with her aunt, uncle and cousin after both her parents' untimely death and her uncle, Sirius Black's, imprisonment. She joins Hogwarts School of Witchcraft and Wizardry unlike every normal student instead she joins it in her 4th year where on the Hogwarts Express she befriends identical ginger twins from the house of Gryffindor and while she gets Sorted into a different house. Read ahead to find out what happens when she falls in love with one of the two twins.
48 parts