What is the main conflict in Revolution by Jennifer Donnelly?

Revolution is a young adult novel by writer Jennifer Donnelly. In this novel, Andi is a teenager who has suffered one of the worst tragedies imaginable - the death of her younger brother. Andi struggles with this death, unable to put it behind her. In an attempt to force Andi to focus on her school work, her estranged father takes her to Paris where she finds the diary of a young actress who cared for the dauphin, Louis-Charles, during the French Revolution. Andi discovers she has a great deal in common with this young actress and a trip into the catacombs seems to pull them together, forcing Andi to learn a lesson from the deaths of two young, innocent boys. Revolution is a story of loss, but it is also a story of hope as the reader travels along with Andi to discover how just knowing her brother changed her entire perspective on life.