Saoirse Callahan's family is broken. Hunger forced them out of Ireland and they still struggle to survive in their new home, where scorching Texas droughts threaten their small farm. Then, on one blazing Sunday afternoon, a series of mysterious fires devastates the region. Whispered rumors of a slave rebellion soon flame into a statewide panic. Vigilantes scour the countryside for arsonists, targeting foreigners and slaves in a bloodthirsty witch-hunt. Saoirse is determined to find out how the fires really started, but the more questions she asks, the more she puts her family and friends...