I came across The Story of the ZX Spectrum in Pixels Volume 2 on Kickstarer here the other day. Looks like a good book to support. It will have 236 pages with 100 games covered. This is the second book in the series, and luckily, you can plegde for both books if you (like me) didn’t support it the first round.
You can go to Kickstarter to support this campainge which is already founded. The Kickstarter ends on January 1, 2015.
The video under is from Volume 1.