Am at Goldini's Restaurant, Gloucester Road, Kensington. Please come at once. Bring a jemmy, a lantern, a chisel, and a gun. S.H. The secret plans for a submarine super-weapon have been stolen and it's up to Holmes to find them. But with the government, the military and even his own brother turning up the pressure, can the genius detective unravel the web of secrets, spies and cunning crimes before it's too late?