At the Western Front, hope fills the air as soldiers believe the end of war is near. Their elation ends, however, when a nurse is brutally raped and mutilated at the Casualty Clearing Station. The Reavley siblings are drawn into the investigation when Matthew, the youngest of them, is charged with the crime.

The Inspector finds certain damning evidence among the nurse's possessions that implicates Matthew. Working in the Intelligence Unit, Matthew cannot disclose why he's at the front or provide a sufficient alibi. The army wants a quick solution and plans to transfer Matthew from the front lines to stand trial within a few days.

Time is short for siblings Joseph and Judith Reavley to expose the real killer. Joseph, a chaplain, interviews his fellow soldiers. He's served with them for 4½ years on the battle line. They are his friends, yet one of them savagely murdered a nurse. Judith, an ambulance driver, feels a similar bond with the men and women who work beside her. Struggling with divided loyalties, Judith and Joseph discover that the Peacemaker may have a hand with the charges filed against Matthew.

Matthew is close to exposing the Peacemaker's identity. Throughout the war, the Peacemaker has tried to sabotage England's war effort. His worst obstacle has been Matthew. Now, the Peacemaker will go to extreme lengths to eliminate Matthew.

This final installment provides edge-of-the-seat suspense as the Reavleys race across war-torn Europe with the Peacemaker's subordinates on their heels. At the climax, each member of the Reavley family faces startling revelations that test their faith and their courage. WE SHALL NOT SLEEP is an excellent conclusion to Ms. Perry five-book WWI saga. The entire series gives readers insight into the lives of soldiers, their sacrifices and the cost to their families.