The Last Seal. by Richard Denning

A powerful demon has been trapped under the city of London for over 300 years. However, malevolent forces are at work in the 17th century, planning to unleash terror and chaos on the world. Two rival secret societies - the Liberati and the Praesidum - are caught in a battle that threatens to destroy the city and its unknowing inhabitants. When a truant schoolboy, Ben, finds a scroll revealing the location of magical seals that bind the demon, this throws him into the centre of a dangerous plot that leads to the Great Fire of London. Ben must overcome his own problems - fear of failure, desire for revenge, guilt over his parents' deaths - if he is to protect the city, and confront the evil demon. As the plot unfolds, a little more of the mystery about Ben's own past and his parents' deaths is made known. Ultimately, Ben and his friends must combat sorcery, defeat the evil Liberati and destroy the demon if they are to save their city and themselves. The Last Seal is historical fantasy and horror for Teens and Adults.