Madame Subayska

In the short story Have You Got Everything You Want?, Madame Subayska is a Slav woman who stole the jewels of Elsie Jeffries while on board the Orient Express using a diversion created with a smoke bomb. Parker Pyne suspected her and she was searched but the jewels were not found on her. It later transpired that she had been engaged by Edward Jeffries, Elsie's husband to steal the jewels which were only paste imitations while the train was on the railroad bridge crossing the sea to Venice.