While working on a plan to bomb Strassbourg, Savage gets trapped in a cellar/shelter during a London air raid. A delayed-action bomb blocks the sole exit. Trapped with him are Lady Constance, Dr. Lewis Glenway, Miner Bert Higgs, and a pregnant woman, Eleanor Nicholls. We learn more about each of the people as they try to free themselves. Dr. Glenway turns out to be Archie Lewis, a lower-class con man who redeems himself. After they are freed, Lady Constance decides to open her home, Penrose Hall, as a home for young women like Eleanor.