Buslenko nodded and turned back to Belotserkovsky. ‘It can’t have been one of us. I’ve been working it out. The four of us here had no opportunity. Captain Sarapenko was outside for less than ten minutes. It would have taken her that long to reach Vorobyeva. You, Stoyan and me … we were all inside.’

‘We don’t know for sure when Vorobyeva was done,’ said Belotserkovsky. An owl hooted in the woods and suddenly flew over their heads, its wings clapping the air. They both swung their weapons to bear on the owl. After a moment they relaxed.

‘We’re getting jumpy,’ said Buslenko. ‘And yes, I do have a rough idea when Vorobyeva was killed. His body was still warm. In these temperatures that means he died just about the time he was supposed to head back to be relieved. And he wasn’t killed by ghosts, so it’s best to keep our wits about us.’

At the top of the river bank, Stoyan kept low and scanned the length of the river. He could see the lights of Korostyshev in the distance. It would take them less than an hour to get there, but the sky was lightening and it would be the trickiest part of the journey. His eyes traced back up the front edge of the forest. The first three ranks of trunks were visible, then blackness. It would stay night in the forest for hours yet. He decided to recommend to Buslenko that they should quit the river bank and use the trees as cover. It would be slower going but safer. He gestured down the bank to Buslenko, pointed two fingers of one hand to his own eyes, then indicated his near surroundings with a sweep of his hand. Buslenko nodded, signalling that it was okay for Stoyan to recce the immediate area.

Stoyan crossed the narrow expanse of open ground between the river bank and the forest. He pressed his back to the bark of a tree, took out a small monocular night-vision scope and surveyed as far into the forest as he could. He could see nothing. Literally. Even the night-vision scope couldn’t penetrate the blackness of the forest’s interior.

‘Stoyan!’ He spun around and aimed the scope in the direction from which he had heard his name called in a loud whisper. ‘Stoyan! Over here!’

Stoyan didn’t reply. He tried to locate the voice near enough that a burst from his assault rifle might hit whoever was there.

‘Stoyan! It’s Tenishchev!’

Stoyan moved closer, keeping low to present as small a target as possible, and keeping his Vepr aimed at the source of the voice.