The murder appeared to be a crime of passion, the killer having left a trail of evidence behind him that even a blind man might have followed.

It was the identity of the victim, not the murderer, that brought Scotland Yard into the case.

No one knew who she was. Or, more correctly perhaps, what name she might have used since 1916. And what had become of the man and the two children who had been with her at the railway station? Were they a figment of the killer’s overheated imagination? Or were their bodies yet to be discovered?

The police in Dorset were quite happy to turn the search over to the Yard. And the Yard was very happy indeed to oblige, in the person of Inspector Ian Rutledge.

It began simply enough, with the London train pulling into the station at the small Dorset town of Singleton Magna. The stop there was always brief. Half a dozen passengers got off, and another handful generally got on, heading south to the coast. A few boxes and sacks were offloaded with efficiency, and the train rolled out almost before the acrid smoke of its arrival had blown away.

Today, late August and quite hot for the season, there was a man standing by the lowered window in the second-class car, trying to find a bit of air. His shirt clung to his back under the shabby suit, and his dark hair lay damply across his forehead. His face was worn, dejection sunk deep in the lines about his mouth and in the circles under tired eyes. He was young, but youth was gone.

Leaning out, he watched the portly stationmaster helping a pale, drooping woman to the gate, the thin thread of her complaining voice just reaching him. “… such hardship,” she was saying.

What did she know about hardship? he thought wearily. She had traveled first class, and the leather dressing case clutched in her left hand had cost more than most men earned in a month. If they were lucky enough to have a job.