The team heads to Latvia to search for an abandoned German artillery bunker that may contain a trove of historic items.
In western Latvia, the team sets out to uncover new clues to the 1944 showdown between Hitler's SS Nordland division and Stalin's Red Army.
A search for a mass grave in western Poland yields an unexpected discovery that raises questions about a turning point in the war.
The excavation team makes use of Soviet military reports to locate the front-line trenches of fierce conflict between Allied and Nazi forces in Latvia's Courland peninsula. As they progress along the front, the experts uncover a live shell that must be detonated under controlled conditions by an army bomb disposal squad, and also find the bodies of fallen German and Russian soldiers. Last in the series.