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London, 1909. Sophie still works in the hat department of the Sinclair department store. After high-profile cases such as finding a stolen mechanical sparrow and exposing Lord Buccaneer, she is increasingly eager to get involved in real detective work. However, nothing has ever been more challenging than returning an elderly lady's missing cat. And here it is, a new opportunity! The most valuable painting in the Sinclair department store, a painting from His Majesty's collection by Benedetto Casselli depicting a green dragon, disappears from a unique exhibition of paintings. Suspicion falls on a young art student, Leo Fitzgerald, who was painting a copy of the painting. The police do not trust her words, and there is no help to be expected. The attackers try to intimidate and even kill the girl! But Sophie and Lil are already passionate about this case! Will the young detectives be able to bring the real criminal to light? And - most importantly: on whose orders did the kidnapper act?