The Greek Interpreter - Holmes' reclusive brother Mycroft makes one of his few appearances, introducing the curious case of Mr Melas.

The Naval Treaty - Tadpole' Phelps is in despair after a vital government document is stolen. He calls on his old schoolmate Watson who, together with Holmes, uncovers a dark world of espionage and murderous intent.

The Second Stain - Holmes must find another missing document, but this time the theft might very easily lead to a political crisis affecting the whole of Europe.

The Final Problem - An epic intellectual struggle between Holmes and Moriarty ends high above the foaming chasm of the Reichenbach Falls In Switzerland.