Kogoro is asked to help News Reporter Rena Mizunashi who is experiencing persistent Knock, Knock, Ginger every Saturday for two months. Conan places a transmitter device outside the door and investigates. On Saturday, Conan reveals that the prankster is a young boy who was using the door bell to wake up Rena for her Saturday morning news report; Two months ago, Rena was moved to Sundays and the boy presumed she overslept. The boy reveals that Rena reminds him of his mother and Rena tells him he must be strong for his mother who recently died and to never see her again. While heading home, Conan forgets his device and returns to Rena's apartment to retrieve it. However the device stuck to Rena's shoe. Conan overhears Rena's conversation and realizes she is talking to Gin. Conan overhears that the Black Organization plan to assassinate a man named Yasuteru Domon, a candidate for Japan's Shuugi-In. Conan, with the help of Jodie Starling, manages to avert the assassination by setting off the sprinklers and thus forces the sniper to abandon their mission. While the Black Organization chases after Domon's car, the FBI manages to intercept Rena's vehicle and capture her. Meanwhile, Gin finds the transmitter on Rena's shoes and concludes that it belongs to Kogoro. As the Black Organization members, Korn and Chianti prepare to fire at Kogoro, they are interrupted by Shuichi Akai's sniper shots. The Organization flees and Gin concludes that it was a set-up by the FBI. Later that day, Conan tells Haibara that with Rena, they will have a lead on the Black Organization.
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