In September 1944, eleven-year-old Billie lives with her great aunt, Doff, eagerly waiting for her older brother Leo to return from boot camp, and desperate to find the father that left when she was little; but Leo brings a friend with him, a Navajo named Denny, and the injured dog they have rescued and named Bear--and when the two young men go off to war, Bear becomes the thread that ties them all together, and helps Billie to find a true friend....

In 1944 Hobie Hanson's father is flying B-24s in Europe, so Hobie decides to donate his beloved German shepherd, Duke, to Dogs for Defense in the hope that it will help end the war sooner--but when he learns that Duke is being trained for combat he is shocked, frightened and determined to get his dog back.

After inheriting her uncle's homesteading claim in Montana, sixteen-year-old orphan Hattie Brooks travels from Iowa in 1917 to make a home for herself and encounters some unexpected problems related to the war being fought in Europe.

In 1940s New Orleans, Fish Elliot is a polio-survivor with a knack for inventing and building things, and his African American neighbor Olympia is a girl with a talent for messing things up, but they are united in an effort to save a starving stray dog they call Liberty--and when Liberty is caged by a nasty farmer, they find an unlikely ally in a German prisoner of war, Erich, who is not much older than the two children.