Opening the Gates of Hell is based on over a decade’s research in archives and sites across Europe. It is a ground-breaking examination of the start of the Nazi–Soviet conflict, a narrative history not just of the fighting, but also the impact on civilians, the atrocities committed by both sides and ethnic cleansing carried out by the inhabitants of the regions invaded. This fascinating history tells the stories of bravery, cowardice, misery and horror through the eyes of those who were there including ordinary soldiers, generals, leaders, politicians and civilians on both sides.

Aachen saw some of the fiercest fighting of the Second World War. Through the determined defense of their city the citizens of Aachen held off the oncoming American forces for six weeks, giving the Nazis time to mobilize their troops for what would become the Battle of the Bulge. Had it not been for dogged resistance of these men and women the last great German offensive in the West might have never occurred, potentially ending the war in Europe six months earlier and saving the lives of thousands.

After the fall of France in June 1940, all that stood between Adolf Hitler and total victory was a narrow stretch of water and the defiance of the British people. Desperate for allies, Winston Churchill did everything he could to bring the United States into the conflict, drive the Soviet Union and Nazi Germany apart, and persuade neutral countries to resist German domination. By early 1942, after the German invasion of Russia and the Japanese attack on Pearl Harbor, the British-Soviet-American alliance was in place.

A scion of the Protestant elite, Theodore Roosevelt was an unlikely ally of the waves of impoverished Jewish newcomers who crowded the docks at Ellis Island. Yet from his earliest years he forged ties with Jews never before witnessed in a president. American Maccabee traces Roosevelt's deep connection with the Jewish people at every step of his dazzling ascent. But it also reveals a man of contradictions whose checkered approach to Jewish issues was no less conflicted than the nation he led.

Prit Buttar retraces the ebb and flow of the various battles and campaigns fought throughout the Ukraine and Romania in 1944. January and February saw Army Group South encircled in the Korsun Pocket. Although many of the encircled troops did escape, in part due to Soviet intelligence and command failures, the Red Army would endeavour to not make the same mistakes again. Indeed, in the coming months the Red Army would demonstrate an ability to learn and improve, reinventing itself as a war-winning machine, demonstrated clearly in its success in the Iasi-Kishinev operation.