Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Best Warhammer 40k book yet!

I had read a few Warhammer 40k books before starting in on the Horus Heresy series (the 'Eisenhorn' trilogy, 'Let the Galaxy Burn', and 'Mechanicum'). Being familiar with Dan Abnett's style, I knew that the book would be good. I found the first two chapters to be a bit confusing - probably because many of the main characters in the series are being introduced for the first time, and the plot is complex. And the entire first half of the book seemed a bit slow. But by the second half, I was fully drawn in. By the end of the book I was blown away, and I can honestly say that the story is a work of genius. I highly recommend it!