Andrew Undershaft, a millionaire armaments dealer, loves money and despises poverty. His energetic daughter Barbara, on the other hand, shows her love for the poor by working as a Major in the Salvation Army. She sees her father as just another soul to be saved. But when the Salvation Army needs funds to keep going, it is Undershaft who saves the day. Is the Army right to accept money that has been obtained by 'Death and Destruction'? Barbara is forced to question her philanthropic motives, and what she discovers tells her something new about the world and its ways.