It was six o’clock of a March morning, and still dark. The long train came sidling through the scattered lights of the yard, clicking gently over the points. Into the glow of the signal cabin and out again. Under the solitary emerald among the rubies on the signal bridge. On towards the empty grey waste of platform that waited under the arcs.

The London mail at the end of its journey.

Five hundred miles of track lay behind it in the darkness all the way to Euston and last night. Five hundred miles of moonlit fields and sleeping villages; of black towns and unsleeping furnaces; rain, fog, and frost; snow flurry and flood; tunnel and viaduct. Now, in the six o’clock bleakness of a March morning the hills had risen round it and it was coming, casual-seeming and quiet, to rest after its long urgency. And only one person in all its crowded length did not sigh with relief at the realisation.

Of those who sighed two at least sighed with a gladness that bordered on passion. One of these was a passenger, and the other was a railway employee. The passenger was Alan Grant; and the railway employee was Murdo Gallacher.

Murdo Gallacher was a sleeping-car attendant, and the best-hated living creature between Thurso and Torquay. For twenty years Murdo had browbeaten the travelling public into acquiescence and blackmailed them into tribute. Monetary tribute, that is. Their vocal tribute was voluntary. To first-class passengers far and wide he was known as Yughourt. (Oh God, it’s Old Yughourt! they would say as his sour face became visible through the steamy gloom of Euston.) The third-class passengers called him a variety of things, both frank and descriptive. What his colleagues called him is nobody’s business. Only three people had ever got the better of Murdo: a cowhand from Texas, a lance-corporal of the Queen’s Own Cameron Highlanders, and an unknown little Cockney woman in the third-class who had threatened to beat him over his bald head with a lemonade bottle. Neither rank nor achievement impressed Murdo: he hated one and resented the other; but he was greatly afraid of physical pain.