Preview of The Map of Moments by Tim Lebbon and Christopher Golden:

Weeks after Hurricane Katrina, Max returns to the devastation of New Orleans to bury the woman he once loved. But in death, he discovers more about her than he ever knew in life: how she was involved with a mysterious, feared organisation; how that organisation is still alive and thriving in the ruins; and how, if Max immerses himself in the city's hidden magic, there may be a chance for him to get her back.