I devoured this book. I was hooked from the start and loved every minute. 
 It had everything I would want in a romance - a strong, alpha hero, and a strong, smart heroine (no Mary Sues to be found here), great banter, action (all kinds), suspense, and a believable love story. Above all, I have to be rooting for an HEA. Iron Duke scored on all counts. 
 What really set the book apart for me was the incredible world building. I loved the steampunk influences - the concept of nanoagents, the melding of organic and metal in the the mechanical modifications, the whole political situation and back story, and of course, the airships. I've always had a fascination with airships. There are even zombies (and although they do up the suspense, this isn't a zombie book). 
 The supporting characters were also well drawn, and didn't feel like window dressing. 
 I can't wait until book 2, and in the meantime, I'm going to check out Brook's other series.