Detective Conan S01 E878 The Blind Spot in the Changing Room (1)

"One truth prevails."

As Ran, Sonoko, and Sera try on swim suits, Conan wonders through the department store and overhears a lady accosting the other people near her dressing room. After Conan leaves, he later hears a scream from that area. The rude woman turned up dead.