Hand of Corruption sees your group of heretics infiltrating an Imperial prison planet, Saint Annard's Penance, with a view to conducting an aracane ritual and converting the planet to Chaos! The three linked adventures try to hit the sweet spot for a Black Crusade campaign; infiltration, insurrection and, of course, action!
There's a fair amount of content, lots of background and info on Saint Annard's Penance, plenty of GM advice, a decent proportion of written dialog and scripted events.
Like most of the 40K RPG books I have, production is to a really high standard (with zero typos spotted so far!) Hand of Corruption has a really nice mix of artwork, including new material, older/existing GW artwork (including the classic Necron Codex cover) and in plenty of different styles.
I'm glad that Hand of Corruption has finally been released, as the whole process has been surprisingly drawn out. As I recall, both Rogue Trader and Deathwatch had their first two full supplements out in the first few months. Black Crusade has been out for close to six months now so should have had a bit more support than it has. I hope that any delays were due to the Collectors Edition release, which took an absolute age.
The problem with getting a campaign book first (or reading it first) is that you're going to have to run the adventures yourself (because, well, you know what's going to happen.) Fortunately, I've ran most of our Black Crusade sessions and am looking forward to seeing how our group of heretics fare in this campaign, particularly against the big guy in act three!
Three more followers to say hello to as well; Headologist (a nice mix of historical and sci-fi,) Monty (historical gaming - with some great looking armies) and Lee Hadley (more commonly known as BigLee and for his Miniature Adventures!)