Holmes and Watson board a passenger train bound from London to Edinburgh, to guard the Star of Rhodesia, an enormous diamond worth a fortune belonging to an elderly woman of wealth; but within the first hour of the trip, the woman's son is murdered and the diamond stolen and any of the passengers in their car could be the killer thief.
A nightclub singer uses alcohol in excess to sooth her painful life.
Aspiring young Scottish politician John Shand enters into an unusual agreement with the wealthy Wylie family -- if they fund his education, he must marry their daughter, Maggie. Staying true to his word, John weds Maggie and begins a successful career, thanks largely to his savvy wife. The couple's relationship is placed in jeopardy when John faces temptation in the form of the lovely aristocrat Lady Sybil Tenterden.
