The greatest detective of them all is back...'Down the Strand the lamps were but misty splotches of diffused light which threw a feeble circular glimmer upon the slimy pavement'.

Whilst the seamy streets of London drown in a sea of smog, Sherlock Holmes sinks into a cocaine-induced melancholy, until Miss Mary Morstan presents him with a most intriguing case, leading Holmes into an epic pursuit of the truth...