In the exciting adventure, Suzy receives a magical invitation to ride the Impossible Postal Express once more. However, her celebration is short-lived when Trollville is struck by a dangerous tremor, putting the entire city in jeopardy. With the lives of its inhabitants at stake, Suzy embarks on a race against time.
Her mission takes her from the enchanting Cloud Forge to the mysterious Uncanny Valley as she seeks to uncover the identity of the villain behind this perilous plot. With the help of the Impossible Postal Express and her determination, Suzy sets out to find the answers needed to save Trollville from impending disaster.