Sinikka Nopola was a Finnish Author, best known for her book series 'Risto Räppääjä' (Ricky Rapper) and 'Heinähattu ja Vilttitossu' (Hayflower and Quiltshoe) that she co-wrote with her sister, Tiina Nopola. Overall she published about 80 works during her over 30-year long career.