Gunpowder and Sorcery in 1666.17th century London - two rival secret societies are caught in a battle that threatens to destroy the city and beyond. When a truant schoolboy, Ben, finds a scroll revealing the location of magical seals that binds a powerful demon beneath the city, he is thrown into the centre of a dangerous plot that leads to the Great Fire of 1666. The Last Seal is a Historical Fantasy set against the backdrop of this, the greatest disaster in London's history. The Last Seal: Gunpowder and Sorcery in 1666.