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Young Sophie has left her job as a saleswoman in the hat department to head the newly created Taylor and Rose detective bureau. There is no shortage of work for the young detectives! Meanwhile, everyone is looking forward to the New Year's Eve celebration in 1910, and Sinclair is, of course, planning to impress London with unprecedented entertainment and luxury once again. The incredible, luxurious Midnight Peacock Ball will take place there! However, Sophie wants to combine a stay at her estate with a visit to her father's former friend, Colonel Fairley. Perhaps he will reveal to the girl the secret of her father's death? However, Sophie is in for a setback: Fairley died under strange circumstances around the same time as Sophie's father. Who is behind his death? The search for the killer once again brings Sophie and her friends into contact with the Brotherhood of the Dragon and the Baron, who this time plans to assassinate the king, cause chaos in London, and... the outbreak of a world war, and has chosen a ball at Sinclair Department Store to carry out his despicable plan.