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In the third episode, the C21 Special Task Force celebrates a major victory as the local police officially arrest the dangerous E2 burglar, earning the young detectives a well-deserved commendation. However, their excitement is quickly interrupted when they find a mysterious anonymous letter in their secret mailbox, written by an unknown person challenging the group to uncover their identity for a chance to join the team. While trying to deduce the author's identity through handwriting analysis, the kids inadvertently uncover and resolve a cheating incident in their physics class
