[2][3] The game takes place in an alternative version of the final days of World War II, with the German army close to defeat.

Adolf Hitler deploys a last resort plan to raise the fallen as zombies through occult rituals and turn them against Allied forces, thus causing Germany to become overrun with the undead.

The trilogy includes a remastered version of the original Nazi Zombie Army and its sequel, which were both released in 2013 as standalone downloadable content for Sniper Elite V2, and a previously unreleased third instalment in the series.

The "X-Ray Kill Cam" feature from V2 also makes a return, in which when a successful and skilled shot is made, the camera will track the bullet from the sniper rifle to the target in slow motion, and upon impact will show an anatomically correct x-ray style reveal of the body part being hit and the damage the bullet causes to the organs and bones.

In April 1945, German dictator Adolf Hitler, who is hiding in the Führerbunker is informed by a Wehrmacht officer that the war is lost and Berlin will soon fall, leaving surrender as their only option.

Once the zombies are released, OSS operative and sniper Karl Fairburne, veteran Red Army infantryman Boris Medvedev, Wehrmacht Captain Hermann Wolff, and German occultist Efram Schweiger are forced to team up in an abandoned village not far from Berlin.

In a fight with him and his minions, the survivors send the demonically-possessed officer back to Hell and discover a tunnel under the church's altar.

Inside, the four discover a reference to a Book of Souls, stored in the Berlin Central Library, which is a safeguard medieval occult text in case the zombies proved difficult to control.

Exiting the facility, the survivors fight their way to the library, where they obtain the book and unleash its power on the zombies, but find that its effects are negligible.

Racing against time, the four successfully penetrate the tower, defeat the occult general atop it, and retrieve the third piece of the Relic.

Fairburne, Wolff, Medvedev, and Schweiger are tasked with retrieving war-winning intel from a British agent named MacNeil who they discover was killed by the zombies after being forced into St. Ulrich Hospital.

They sabotage the industrial plant that the Führer is using to manufacture weapons, equipment, and food supplies for the zombie army and then face off with Hitler himself.