From the bestselling author of Horrible Histories, named 'the outstanding children's non-fiction author of the 20th century' by Books For Keeps____________________King Vortigern thinks he's so clever but his servant Mervyn knows he is playing a dangerous game.Can Mervyn keep the King safe from the invading Saxons, Pictish raiders, and a beautiful Saxon princess?Join master storyteller Terry Deary for a trip back in time to Saxon times and an exciting adventure. ____________________‘Bubbling with wit, language play and robust dialogue....just the right mix of ingredients to trigger young readers' interest in all things historical.’ Books For Keeps