After freeing the President's daughter in book #3, Quest (Q) and his stepsister, Angela, head to Texas for their parents' next concert. The Ghost Cell also intends to strike in San Antonio. The Ghost Cell seems to have an interest in Q and Angela, as they are kidnapped for a second time. With Boone's and the SOS team's help, they manage to escape and destroy another member of the Five, as well as save the monument to the Alamo. Next stop is Chicago. But will they ever discover Boone's secret? Great book. Definitely recommend the entire series. The I,Q books continue to grab your attention as Q (Quest) and Angela travel in their parent's motor coach to each new music venue and in their travels follow the path of a terrorist sleeper cell. While they travel with what appears to be regular roadies and bodyguards Q and Angela become deeper envolved with the group trying to take out the sleeper cell although they would rather they stay safe wherever they are placed. The Alamo continues the series leading the reader to Chicago and wondering what will happen next.