Book excerpt: In turn-of-the-twentieth-century France, Vincent - an ingenious designer of secret passages - embarks on a thrilling adventure to unlock ancient mysteries in a quest for a lost treasure. Along the way, he battles against dark forces as he tries to discern who he can trust, while racing against the clock. Vincent knows what it means to keep a secret. With his troupe of talented craftsmen - his only family - he designs hidden compartments for priceless treasures and passages for undetectable escape routes. The rich and powerful who hire him pay handsomely for his work - and for his discretion. As Paris hosts the 1889 World’s Fair, the city fills with visitors who come to see the controversial new Eiffel Tower with its gravity-defying elevators, to discover the latest inventions from across the globe, or to scout for prospective investment opportunities. After Vincent takes on an urgent secret mission, his team suddenly becomes the target of attempted assassinations. In a race against time, as death licks at their heels, they puzzle over who could be behind the violence. A client trying to erase tracks to a secret? The dark forces of the occult somehow provoked by their work? Confronted with mysteries uncovered from the past, and a life-or-death challenge that tests the limits of his ability, Vincent will do everything in his power to thwart the menace and protect his friends... if only he can survive.