You did not say if you were looking for a book of flight exercises or a technical book covering the basics of flight.
Flying Training Vol 1 by Trevor Thom and Flying Training Vol 1 by Jeremy Pratt both cover the Flying Exercises.
Trevor Thom's Volume 4 covers aeroplane technical and principles of flight.
Jeremy Pratt's Volume 4 also covers the technical aspects.
Flight Briefing for Pilots Vol1 and 2 by Birch and Bramson were very good books a few years ago and covered the full PPL syllabus. Unfortunately they are a little out of date now.
If you are trying to get someone interested, the flying training manual Vol 1 is probably a good start.