Wattson brothers, William and Bob, are back from their adventure in the early 1800s Montana, and they have a brief encounter with the Corps of Discovery, Lewis and Clark. This was made possible by their deceased father's immense fortune and one other thing: a craft for traveling through time. The brothers are contacted by their father's closest friend. He is a fellow time traveler and their substitute parent, Dailey. Looking through artifacts from past trips, found an interesting note written on parchment between the pages of an ancient book. It was a pleading message from a friend of their father's, King Edward IV of England, in the year 1483. King Edward is on his deathbed. He is concerned about the fate of his two young sons, including his heir, Edward, Prince of Wales. The threat is his brother, the future Richard III. Ultimately, his brother takes the throne, and the sons disappear. Dailey thinks their father never saw the note. The brothers decided their father would want them to investigate, and they plan to do so. Along with their companion Spear, a young Crow brave from Montana, they travel back to Middle Ages England. They experience medieval life, meet historical figures, and take part in the famous Battle of Bosworth Field. They also plan to rescue the young princes from the Tower of London. This mission takes them through England, to Ireland, and back to England.