For plucky Lillian Avery, America's entry into World War II means a chance to prove herself as a pharmacist in Boston. The challenges of her new job energize her. But society boy Ensign Archer Vandenberg's attentions only annoy -- even if he "is" her brother's best friend. During the darkest days of the war, Arch's destroyer hunts German U-boats in vain as the submarines sink dozens of merchant ships along the East Coast. Still shaken by battles at sea, Arch notices his men also struggle with their nerves -- and with drowsiness. Could there be a link to the large prescriptions for sedatives Lillian has filled? The two work together to answer that question, but can Arch ever earn Lillian's trust and affection?