When Dennis comes into possession of a book that shouldn't exist, a new chapter in his life begins and a different, alternate London reveals itself - and with it a cast of characters each more unlikely and fantastical than the last. Long London occupies precisely the same geographical space as our London ­- but it is a city built from dreamscapes and art, from fiction and nightmares.

This is the London of penny dreadfuls and William Blake's dark woodcuts, colliding with Dennis' own time - that of a post-war capital, not long rebuilding itself from its own recent nightmare of war and bombing.

This series will be a mad and magical A to Z of the greatest city on earth - with a tale of friendship, murder, betrayal and mischief and the very centre of the map...

Alan Moore is an English writer widely regarded as the best and most influential writer in the history of comics. His seminal works include From Hell and The League of Extraordinary Gentlemen. He is also the author of the bestselling Jerusalem. He was born in Northampton, and has lived there ever since.