Curse of the Narrows- By Laura M. MacDonald. In 1917, the busy Canadian port of Halifax, Nova Scotia, was crowned with supply ships servicing the war in Europe. On the morning of December 6th, the vessel Imo collided with the Mont Blanc (a ship packed with high explosives) in the hard to navigate narrows of the harbor. Minutes later, a catastrophic explosion set off a chain reaction of events that would devastate the city. Set against the back drop of WWI, this book chronicles one of the most dramatic events in North American history.