GOSICK -ゴシック- Season 1 Episode 10

Kujo encounters the same girl he met at the department store, and with the help of hers and a bright homeless boy, he manages to put the police back on the case. Kujo and Grevil then ask Victorique’s opinion about the store, just to find that she already had made some research about it, and she comes with a plan to expose the culprits.