คดีกระดุมที่หล่นหาย

Paul Antony-Barber

Professor Charles Thompson

Ravi Aujla

Professor Kishore Malik

Billy Byers

Young Mycroft

Lucien Guo

Young Sherlock

Mark Hawkins

Asylum Director

Purdy Hughes

Young Beatrice

Ian Midlane

Professor Ambrose Roberts

Scott Reid

Constable Lestrade