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While Kogoro is at a client's house, the woman is murdered. The suspects are the only other guests in her house: her son, daughter, and the maid.
Several people are staying in the hotel, but Kogoro thinks it is the work of an outsider. Conan discovers what the culprit really did, using a modified crossbow.
The Detective Boys stumble onto a group of robbers with a dead body while camping. Conan helps the Detective Boys get away, but he is shot in the process!