The final collection of Sherlock Holmes' stories, the world's most beloved detective - now a Penguin Essential.

'Come at once if convenient - if inconvenient come all the same... '

The note from Sherlock Holmes to Dr Watson cannot be ignored and soon the pair find themselves investigating the curious case of an aged professor whose sudden strange alteration in behaviour terrifies everyone from his daughter and her fiance to the family dog. This and eleven other cases which confound clients or perplex the police are tackled by Holmes and Watson in the final collection of the duo's detecting adventures.