It's 1914, and talk of war feels far away to Henry Gaunt and Sidney Ellwood. At 17, they're too young to enlist, and anyway, Gaunt is fighting his own private battle - an all-consuming infatuation with his best friend, the dreamy, poetic Ellwood - not having a clue that Ellwood is in love with him, always has been. When Gaunt's German mother asks him to enlist as an officer in the British army to protect the family from anti-German attacks, Gaunt signs up immediately, relieved to escape his overwhelming feelings for Ellwood. Though Gaunt tries to dissuade Ellwood from joining him on the battlefield, Ellwood soon rushes to join him, spurred on by his love of Greek heroes and romantic poetry. Before long, their classmates have followed suit. Once in the trenches, Ellwood and Gaunt find fleeting moments of solace in one another, but their friends are all dying, right in front of them, and at any moment they could be next.