FATAL RIVARY Book Trailer

In 1066, the rivalry between two brothers brought England to its knees. When Duke William of Normandy landed at Pevensey on September 28, 1066, no one was there to resist him. King Harold Godwineson was in the north, fighting his brother Tostig and a fierce Viking invasion. How could this have happened? Why would Tostig turn traitor to wreak revenge on his brother?