The Detective Boys are on a camping trip accompanied by Ran. Later they witness an arguing couple who then leaves. They then set up the tent in the couple's area. Later, the couple returns demanding their place back and the girlfriend decides to let them have it. Later Ran is drugged and kidnapped. The kidnapper is later found in another car in a road accident. Conan reveals the boyfriend hired the kidnapper to murder his girlfriend, but captured Ran instead because of their tent placement. After examining some clues, he realizes that Ran is in a river and that the it will flood at 3o'clock. After saving Ran, everyone becomes exhausted except for Ran who has just woken up from her nap.
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