In June 1915, on her 11th birthday, Gabrielle is looking forward to a day of adventures! Little did she know that her adventure would last more than two years! Her father works at the construction site for a bridge over the St. Lawerence River at Quebec. The first attempt to build it resulted in a major engineering failure and more than 70 workers lost their lives. Gabrielle meets the Chief Engineer of the bridge company who, seeing her interest in the project, invites her to learn about bridge building. Her journey begins.