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"The Last Trickster" follows Inspector Cyril Fenton as he confronts a series of cunning crimes orchestrated by a brilliant mastermind calling themselves "The Last Trickster." The story begins with a millionaire's murder in a locked room, subsequently uncovering a complex web of revenge and manipulation marked by poetic riddles and Joker cards. Fenton discovers that "The Last Trickster" is not merely a killer but a criminal artist directing a theater of human puppets, manipulating various characters with diverse motives. Ultimately, this unknown genius succeeds in executing a revenge plot for a deeply humiliated dignity, escaping with the Diamond and leaving Fenton to pursue a shadow disappearing into the horizon.