The Motor Girls, a group of friends, embark on a new adventure filled with mystery and intrigue. When a valuable table and promise book belonging to Wren, a young girl with a physical disability, go missing, the girls are determined to find them. Their investigation leads them to the enigmatic Clip, whose motives are shrouded in secrecy. As they delve deeper, they encounter the mischievous Sid Wilcox and his accomplice Rob Roland, adding to the complexity of the case. The story unfolds as the Motor Girls navigate the twists and turns of their search, encountering unexpected challenges and uncovering hidden secrets along the way.