December 6, 1917 was a normal day in Halifax, Nova Scotia. People went to work, children went to school. All this changed when two ships collided in the harbor, unleashing the largest man-made explosion before the atomic bomb. This book provides a riveting account of the explosion, and the tsunami and blizzard that followed. It is the story of devestation, as well as a community and nation coming together to deal with the disaster. Walker has written another engrossing book.