There's been talk about a ghostly boy appearing in the Long Island town of Oyster Bay. When two brothers and their two cousins go searching for the ghost at the historic Raynham Hall, they stumble upon not one but two apparitions. They also find something even more unbelievable-a portal to the past. The brothers approach Grandpa George, who reveals his knowledge of the otherworldly beings. This starts a chain reaction of supernatural events unfolding. Grandpa George explains about a battle through time fought between malevolent forces that want to alter history and those who aim to protect it. With the advice of Grandpa George, the children vow to save history from being changed for the worse. They step back in time, to embark on an adventure during the days of the Revolutionary War. As they familiarize themselves with a whole other way of life, they are put to the test. While on their journey, the children encounter dangerous characters and situations, but they also meet new friends who help in their quest. As time runs out, it is solely up to them to protect the past to keep life in the present intact.