Henry Bogget is an ordinary boy of just eight years old, and Henry has a secret. A secret that has been kept for many, many years. A secret about magic in London... In England, whenever someone changes the world and leaves their mark on history, a little round blue plaque is placed on the house where they once lived to make sure they can never be forgotten. With every discovery made, artwork painted or song written, a little trace of very powerful magic, an enchantment, is left behind. One night, not too long ago, Henry discovered this secret and his life changed forever. An adventure beyond his wildest dreams was about to begin.