1944-45 Campaign (May Start) - War in the West

In retrospect Normandy seems such an obvious landing site that an invasion anywhere else is hard to conceive, but what if ULTRA indicated the Germans were on to it? Could the invasion have been launched sooner,could it have gone in somewhere else, and could the Germans have responded better? These and other intriguing possibilities can be explored in this hypothetical 1944-1945 campaign.