Mary Beacock Fryer is a well-known expert on Upper Canadian history. She has written a trilogy on the Simcoe family: Elizabeth Posthuma Simcoe: A Biography, Our Young Soldier: Lieutenant Francis Simcoe, 6 June 1791-6 April 1812, and John Graves Simcoe: 1752-1806, A Biography. Among Fryer's other books are Escape, Beginning Again, and Buckskin Pimpernel.
At the beginning of the American Revolution, Justus Sherwood left his young family in order to serve with the King’s forces, first with General Burgoyne on his disastrous invasion of New York. He was soon appointed Supervisor of Spies and Prisoner Exchanges, and from his "Loyal Blockhouse" on Lake Champlain he sent out raiding parties and spying missions to harass the rebels in New York and England.
"A biography of this type must take into account the unsettled political climate of the area and times and this Fryer does with admirable dexterity."