[1] Although Gratz has written several other historical fiction novels set in World War II, including Prisoner B-3087, Projekt 1065, Grenade, and Heroes, each stands alone.

The story starts with a sixteen-year-old boy named Douglas "Dee" Carpenter and his friend Sid Jacobstein, who are soldiers traveling in a boat, preparing for the fight against the Nazis.

Simultaneously, nineteen-year-old Lance Corporal James McKay and his friend Sam Tremblay are ready to jump off an airplane into the Nazi battlefield, knowing that they are going to die.

While the Panzer is traveling, Dee overhears the Germans talking about taking revenge on the French for blowing up the supply depot last month.

Dee was worried about who's going to stop the Nazis, but Sid reminded him that the entire free world united for the common good and that they were stronger together and allies.

Julie Hanson of Seattle’s Child “found [Allies] a riveting read and a good introduction to World War II and D-Day.

They’re real people whom young readers will believe in and relate to.”[5] The School Library Journal's Kaetlyn Phillips said “A complex moment of history is deftly explored.