Milly and Molly is a children's book series created by Gillian Rubinstein and illustrated by Catherine Kullmann. The stories follow two best friends, Milly and Molly, who embark on various adventures in their small town. Each tale emphasizes themes of friendship, problem-solving, and creativity, making it relatable for young readers. The series is designed for early readers and features simple language and engaging illustrations. Milly and Molly's experiences encourage children to explore their surroundings and learn valuable life lessons. The books are popular in schools and libraries, promoting literacy and a love for reading among children.