This would be better if it were not intended first as a story, for the historical facts dominate it so that the story and fictitious characters seem dragged in and unimportant. The author obviously knows her history of the Netherlands; she has chosen the dramatic period of the eige of Leyden, and she has built her tale around three children, close friends, who represent the important religious groups, and who play an active part in getting messages through the enemy lines.