The ever-efficient Rodgers pulled a one-inch Survey map out of the pocket of his car, and studied it. The field opposite which they had stopped looked to Grant’s urban eye exactly like any other field that they had passed since leaving Wickham, but the Inspector said: ‘It should be about opposite here, I think. Yes; there’s where they were; and here is us.

He showed the lay-out to Grant. North and south ran the road from Wickham south to Crome. West of it lay the Rushmere, out of sight in its valley, running north-east to meet the road at Wickham. At a point level with where they were now halted, the river ran back on itself in a wide loop over the flat bed of the valley. At the point where it first curved back, Whitmore and Searle had made their camp. On the farther side of the valley, where the river came back level with them, was Salcott St Mary. Both their camp and the village of Salcott were on the right bank of the river, so that only a short mile of alluvial land lay between their camp and the village.

As the three men reached the third field from the road, the countryside opened below them, so that the relevant section of the Rushmere valley was laid out for them as it had been on Rodgers’s map: the flat green floor with the darker green scarf of the Rushmere looped across it, the huddle of roofs and gardens on the far side where Salcott St Mary stood in its trees; the lonely cluster, back up the river to the south, that was Pett’s Hatch.

'Where is the railway from here?' Grant asked.