This is a good intro to the topic of Stalinist terror. To a novice reader, it will be a bit hard to keep all of the names straight, but it will also be a real eye-opener -- you'll see where Orwell mined many of his ideas. I'd strongly recommend that all readers of this gravitate to Kravchenko's I Chose Freedom (cliched title, I know, but a great autobiography).
Instead, it is actually a scholarly work with incredible detail regarding the politics and behind the scenes happenings during those terrible times. As such, it was an incredible piece of work, possibly the best of its type. If this is what you are seeking, get it because you will find none better. You won't breeze through it, but you will feel very educated when you finish it.