<p>In the depths of the blackout, the silence of London's Royal Albert Dock is broken only by the lap of inky water against the quay and the occasional scurrying of rats' feet. A patrolling policeman is passing the newly arrived freighter SS Magnolia when something catches his eye. A man is sprawled awkwardly across a nearby barge - with an exotic-looking dagger in his back.<br><br><br>DI Jago of West Ham CID discovers the victim was a dock worke...