A white man walks into the library. He’s dressed in an old-fashioned charcoal-grey suit, has an old-school haircut and grey eyes. He’s got that effortless posh style that Simon’s mum only wishes she had. His name is Thomas Nightingale, he is a detective chief inspector and is at least a hundred years old, though he don’t look it. He is also Britain’s only licensed, fully qualified wizard.

