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Heiji reads a letter he received from an already dead man and old acquaintance of his mother, design company president Kouhei Wakamatsu, who was killed a month earlier in his Karuizawa villa.
Heiji and Kazuha visit Tokyo where the two part ways. A murder occurs at the restaurant Kazuha is in, forcing Kogoro, Ran, Sera, Heiji, and Conan to investigate.
The police arrive and their investigations reveal the baumkuchen was cut evenly into eight pieces and that only one of the piece was poisoned.