Abstract: The measurement of the last unknown active neutrino mixing angle (theta-13) is a top priority for High Energy Physics over the next 4-5 years. Until this is measured, it is not known whether it is feasible or not to solve the neutrino mass hierarchy problem or to look for CP violation in long baseline experiments. One way to attack this problem is by doing a precision medium-baseline reactor neutrino experiment. A European-American collaboration is proposing to do just this at an existing Chooz neutrino physics lab. It's Double Fast. It's Double Cheap. It's Double Chooz.