The Blood of Heroes: The 13-Day Struggle for the Alamo--and the Sacrifice That Forged a Nation by James Donovan
There are hundreds of books about the siege of the Alamo. Of the dozen or so that I’ve read, this is by far the best. It is well written, well researched and well balanced. It give the reader the background of what led up to the battle and what happened afterward. It also gives the sometimes-unsavory history of the key players. (Crocket comes off best.) it corrects many of the myths of the Alamo. There was only one Mexican assault which overran the garrison. Crocket did not surrender to be executed—he died fighting. I think this will be the standard history of the Alamo for years to come. If you are a history buff, I highly recommend it.