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.

DI Jago of West Ham CID discovers the victim was a dock worker by day and a Home Guard volunteer by night - and there are things even his wife, bombed out of their flimsy home in Silvertown, doesn't know about his past. Who wanted to kill him? As Jago investigates, he uncovers a widening circle of secrets ranging across family tensions, the last war, and a far-flung corner of the British Empire. And then there's the mysterious spate of thefts from the dock to contend with.