Bholanath and Khudabaksh are two soldiers in the British Indian Army, sent off to Europe to fight in World War I. One happens to be Hindu and the other happens to be Muslim, but that doesn't keep them from being the best of friends.

When a mission in a surveillance balloon goes awry, these two gentle soldiers-along with an exceptionally ill-tempered squirrel-are set adrift high above the Western Front. What follows is a grand tragicomic adventure, taking them into the heavens and across a continent gone mad with war. Together, they learn about the worst humankind can do . . . and how true friends, however unalike their identities may be, can soar above it all.