Anachronist

What would you do if you could change your past?
 
For fans of Harry Potter and Doctor WhoA coming-of-age story about a teenage boy and his journey into the secret world of time guilds, memory vampires and extinction curators**
Josh has spent the last 17 years trying to stay out of trouble and failed miserably - one more strike, and he's going to jail. His mum is sick, and they're deep in debt to a local gang - there's nothing left to sell except for the TV, and that's the only thing keeping her sane.
Desperate, he breaks into the house of the local eccentric, the Colonel, and his life changes forever. Josh stumbles into the secret world of the Oblivion Order, a secret organisation of time travellers sworn to protect the future by altering the past. Moving back through time using ancient artefacts, Josh encounters extinction curators, seers, memory vampires, chapter houses constructed from rooms in different centuries and Caitlin, a beautiful librarian who teaches him about the past and shows him a future he never dreamed he could have.