On Her Majesty's Behalf (2014)

After a surprise attack on London and New York, the Germans introduced a new type of gas—corpse gas—a revolutionary weapon that resurrected the bodies of the dead.

For those who survived the killing fields of France, the danger has only just begun. Veteran Major Michael "Madman" Burke and his company have just been assigned a daring new mission by the president himself: rescue the members of the British royal family. But Manfred von Richthofen, the undead Red Baron and newly self-appointed leader of Germany, is also determined to find the family.

In the devastated, zombie-infested city of London, Burke and his men will face off in an unholy battle with their most formidable opponent yet: a team of infected super soldiers—shredders—who have greater speed and strength than their shambler predecessors. If they don't succeed, all of Britain will fall into undead enemy hands.