In the past: a man crawls desperately through a claustrophobic escape tunnel beneath a POW camp in the Cambridgeshire Fens. Above, a shadow passes across the moon; ahead, only death awaits him. In the present: local journalist Philip Dryden is reporting on an archaeological dig at the old POW camp when a body is uncovered. But there is something odd – the man appears to have been shot in the head and the position indicates that he was trying to get into the camp, not escape it. It’s a puzzle that excites Dryden far more than it does the archaeologists and the police. That is, until a second, more recent body is discovered . . .