 Conan and his caretakers, Ran Mori and Kogoro Mori, are given a free trip to London after finding a cat that belongs to Diana Kingstone, a rich British woman.For the trip, Conan is given two pills by Ai Haibara; the pills will temporarily suppress the poison which turned him into a child allowing him to use his teenage identity, Shinichi Kudo, to bypass airport security.After the medicine wears off, Conan rendezvous with Ran and Kogoro to visit the Sherlock Holmes Museum at 221B Baker Street.