Izzy, a young American Irish dancer, is a fun girl but just a little bit bossy. Her twin brother, Joe, loves soccer and aggravating Izzy. Together they are magically whisked away to 18th-century Ireland during the time of the culture crushing Penal Laws. There they hide from soldiers, climb into a castle, and befriend a quirky and rebellious Dance Master whose job it is to keep the culture alive. When soldiers confront the Dance Master the twins must get past their annoyance with each other to work cleverly and together in order to save him. But even if they can do that, will they be able to return home to their 21st-century family and friends? "Sound the Warning" is not only a story about survival in an oppressed country, but it is also a story of how family loyalty and a little bit of Irish magic can overcome many problems.