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Heiji has a client in Tokyo who suddenly turns him down. Shortly thereafter, her home burns down!
Conan gets Heiji's message and sends a hidden message back. The henchmen watch over Kazuha and threaten to kill her if Heiji does not cooperate.
The arson incidents have been happening one district at a time, the fourth in the 4th district. The 5th district could be next, home to the Mouri Detective Agency!