About Tillie Walden Books by Tillie Walden Tegan and Sara: Crush by (author) Tegan Quin & Sara Quin illustrated by Tillie Walden Ages 10 to 14 Grades 5 to 9 Tegan and Sara: Junior High SIGNED by (author) Tegan Quin & Sara Quin illustrated by Tillie Walden Ages 10 to 14 Grades 5 to 9 Tegan and Sara: Junior High by (author) Tegan Quin & Sara Quin illustrated by Tillie Walden Ages 10 to 14 Grades 5 to 9