Tula is a fun-loving tree-troll who loves to play in the forest, but one day while exploring the forest, she is captured and imprisoned! Her captor is called Cedric, who is big and strong despite being only 12 years old, and is a cruel bully who delights in causing misery. But Cedric has a giant sister: Polly, with whom Tula develops a heart-warming friendship. Join Tula and Polly's charming and heart-warming forest adventure! Will Polly be able to free Tula? Is she truly 'Pure of Heart'? And what secret does Polly's grandmother hold?