Synopsis

Conan and Heiji solved a puzzle left by a woman to her four sons, sons who had served faithfully for years in the household of a wealthy family. Their investigation led them to Warehouse 4 in Haido Harbor. There, they discovered a scene of violence: a man lay bleeding from a head wound, surrounded by three others. These were the brothers, summoned by their mother's coded message. The deceased was the eldest. He had invited his brothers to the warehouse, but by the time the first brother arrived,