When the present offers no hope for the future, the answers may lie in the past. AJ Flynn has just failed all but one of his GCSEs, and his future is looking far from rosy. So when he is offered a junior position at a London law firm he hopes his life is about to change - but he could never have imagined by how much. Tidying up the archive one day, AJ finds an old key, mysteriously labelled with his name and date of birth - and he becomes determined to find the door that fits the key. And so begins an amazing journey to a very real and tangible past - 1830, to be precise - where the streets of modern Clerkenwell are replaced with cobbles and carts, and the law can be twisted to suit a villain's means. Although life in 1830 is cheap, AJ and his friends quickly find that their own lives have much more value. They've gone from sad youth statistics to young men with purpose - and at the heart of everything lies a crime that only they can solve. But with enemies all around, can they unravel the mysteries of the past, before it unravels them?