1588: Queen Elizabeth is felled by an assassin's bullet. Within the week, the Spanish Armada had set sail, and its victory changed the course of history.

1968: England is still dominated by the Church of Rome. There are no telephones, no television, no nuclear power. As Catholicism and the Inquisition tighten their grip, rebellion is growing.

Keith Roberts (1935-2000) was a British SF author, most famous for his alternate history novel Pavane.