This book by Chris Roberson tells the tale of some Imperial Fists as they go from being "regular" humans through their induction into the Fists, their time as scouts and their eventual elevation to full battle brothers.
This book is interesting because in the book Heroes of the Space Marines which was published a year or so ago, we see the main characters in the short story Gauntlet Run. So this first story falls somewhere in the timeline of the novel, but isn't really discussed.
This wasn't a bad book but I kept having the feeling I'd seen it before. This is a story of "savages" taken by the sky warriors to become space marines. I was thinking, "I saw this in Space Wolf." They even have the plot device of Zatori hating du Quest because du Quest killed Zatori's master before both were taking up by the space marines. This is just like Ragnar hating Strybjorn in Space Wolf, but this is even better because in Sons of Dorn, you also have Taloc hating Zatori because Zatori killed Taloc's father! Its a hate three-way! So I'm sure that like Space Wolf, the three will finally come to an understanding that all of that drama was in their old lives, and their bond as battle brothers is stronger than past transgressions.