This, in the guise of a free Kindle book, is a small brochure about an OU course, which appears to deal largely with ethics. It includes a brief summary of the course approach, and some study material and brief exercises on one topic. It is not a full course, or a basic guide to philosophy in itself. On my Kindle desktop app it had only six full 3-column pages, plus several others with only one or half a column. The item description should be clearer about its brevity & contents.
The material here I would consider upper-tier GCSE to AS-level standard, and it seems on a par with other level 1-2 OU courses. I was only having a look because it was free, and I'm not, in fairness, the target audience: e.g. I thought the discussion of Isiah Berlin's positive & negative freedom could have been broadened using a comparison with Rawls' freedom from & freedom to - but it was fine as a summary of Berlin's theory.