The wood beyond - Reginald Hill

Dalziel and Pascoe become involved in a present-day murder investigation that takes Pascoe back to his family's past and the Passchendaele Campaign of World War 1, and Dalziel into the arms of a possible killer.

When animal-rights activists uncover a long-dead uniformed body in the grounds of Wanwood House, a research facility, Dalziel is presented with a seemingly insoluble mystery. And he is further perplexed when he's attracted to one of the campaigners - now implicated in a murderous assault.

Meanwhile, the death of his grandmother has led Peter Pascoe to the battlefields of World War 1 and the enigma of who his grandfather was - and why he had to die.