High in the pine forests of the Spanish Sierra, a guerrilla band prepares to blow up a vital bridge. Robert Jordan, a young American volunteer, has been sent to handle the dynamiting. There, in the mountains, he finds the dangers and the intense comradeship of war. And there he discovers Maria, a young woman who has escaped from Franco's rebels.

High in the pine forests of the Spanish Sierra, a guerrilla band prepares to blow up a vital bridge. Robert Jordan, a young American volunteer, has been sent to handle the dynamiting. There, in the mountains, he finds the dangers and the intense comradeship of war. And there he discovers Maria, a young woman who has escaped from Franco's rebels.