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All aboard for a high-speed new case in the third installment of this middle grade mystery series for fans of A Series of Unfortunate Events and Enola Holmes.. Stranded on a mountain in Peru after the crash of a luxury airship, John Boarhog has only one mission on his mind: reuniting with his mentor and guardian, Inspector Toadius McGee. John's convinced that if he makes his way to a plume of smoke in the distance, the great detective will be waiting. The only problem is there's a whole rainforest between them.. After battling their way through the Amazon, John and his friends find a train - The Peruvian Express - and its glittering owner, Oro Del Rey, the Golden King, who offers them passage as they continue to search for their loved ones.. Soon John's investigation goes off the rails when he's asked to help to locate an infamous Object of Doom.