The ZX Spectrum - Your Personal Computer is published by Prentice/Hall International and written by Ian McLean, Simon Rushbrook Williams and Peter Williams.
The first third of it is taken-up by drawings of the Spectrum keyboard with marks showing the relevant key positions. Some readers may regard that as an insult to their intelligence, as all of those key functions are marked clearly on the Spectrum.
There are, however, several redeeming features. The text is clearly set out and the examples are excellent. The chapter on loading and saving programs is useful but merely repeats the one in the Spectrum manual.
It is a useful adjunct to the Spectrum manual and costs £5.95.