Terror by Night

On a perilous train ride from London to Edinburgh, the legendary Star of Rhodesia diamond is on board, guarded by Sherlock Holmes and Dr. Watson alongside Lady Margaret Carstairs, its owner. When Lady Carstairs' son's body appears in a coffin meant for her recently deceased mother, murder and theft ensue, leaving Holmes and his trusty sidekick to unravel a complex web of clues and suspects. As they dig deeper, they uncover a surprising double-cross and a sinister plot by the notorious Colonel Sebastian Moran.