Even as I was writing 'Empire State,' I knew there were more adventures for the main character, private detective Rad Bradley, to have. I also knew that the world was far larger than what I'd presented in book one.

My own writing has perhaps more of an American flavor than a British one, but that's because the stories I've so far written have needed it. 'Empire State,' 'Seven Wonders' and 'The Age Atomic' are all very place-centric, where the setting itself is almost a character. But there is a universality to story that isn't just limited to science fiction.

The appeal of the Golden Age heroes for me is their simplicity, even their naivety - they represent the fundamental building blocks of the whole superhero genre, whether it's a 'super' man able to lift cars, or a vigilante who terrorises criminals at night like Batman.

I discovered 'The Shield' back around 2010, when the Archie superheroes were licensed to DC Comics. From there, I went back into the archives and discovered this whole universe of characters, and I was hooked.