‘Education never ends, Watson. It is a series of lessons with the greatest for the last.’

As Britain edges closer to World War I, Sherlock Holmes is persuaded back from retirement to help fight against the Germans. The British Prime Minister calls on his expertise to infiltrate a German spy ring and capture a notorious undercover operative, Von Bork.

With the help of his faithful partner, Dr Watson, Holmes goes on one last adventure to help save his country.