Johnny Mackintosh and the Spirit of London is the first novel in a series of young adult books written by Keith Mansfield and published by Quercus.

The book opens on the thirteenth birthday of the title character and is written entirely from Johnny Mackintosh's point of view.

Set in the early 21st century, the book opens with Johnny Mackintosh living in a children's home (Ben Halader House) located in the fictional Castle Dudbury New Town in the county of Essex, United Kingdom.

[1] As the book develops Johnny Mackintosh is abducted by aliens and travels to the centre of the Galaxy, before returning to Earth, but in the distant past.

He witnesses the extinction of the dinosaurs and the destruction of Atlantis, before returning to the present day and discovering the truth about his parents.