It begins with an 80-year-old mystery. Three men-a father and his two sons-vanished while working as laborers on a dangerous project to build the first road through the Florida Everglades. Now, years later, a series of letters are unexpectedly discovered by a descendant of these men. Driven by the need to know what happened to these lost members of his family, he starts asking questions-and is quickly stonewalled. With nowhere else to turn, he enlists the help of former Philadelphia police officer Max Freeman.