Ran, Kogoro and Conan are at the hospital where Eri has had appendix surgery. While coming out, Kogoro and Conan run into Amuro and they find a woman dead from poisoning. They figure out that the woman, Reina, was visiting a sick friend Juri, and they were having tea party with two more friends. The police interrogates each of the suspects, which reveals their possible motive; Tokie's former boyfriend was stolen by Reina and became her current husband, Katsuki lost large amount of money because of the stock that Reina recommended, and Juri's son failed an exam because he caught a cold from Reina's son. The three of them denies wanting to kill the victim, since it is not possible to switch a teacup with different colors of tea to poison her.