Case Closed: A Secret Order from London(2011)

Meitantei Conan: London kara no Maru Hi Shirei

A Secret Order from London is the eleventh OVA of the anime and manga franchise Detective Conan. The plot revolves about Ai Haibara spending her time with Ayumi while Conan and company travel to London, only to be beset by a group of sinister-looking persons.