Great Britain is in deadly peril when plans for a new submarine disappear, stolen apparently by a junior clerk who has been strangely murdered. Brother Mycroft leaves his accustomed habitat in desperation to insist the great Sherlock act.
A young man is falsely accused by his father of stealing valuable British jewels; but Sherlock Holmes uncovers an even more sordid plot. Will the wealthy banker recover the treasure and redeem his honor?
