While Storms of Fate follows Victor going through the Inner Sphere, Operation Audacity follows Archer Christifori as he takes the battle to the Falcons who dare invade.
Basically Operation Audacity’s goal is to strike at a planet in the Falcon occupation zone to cause them to have to pull back. This would be easy if not for the need to link up with Adam Stiener, a relative of both Victor and Katrina. He just happens to believe (thanks to Katrina) that Victor killed Melissa, Victor and Katrina’s mother. He was also responsible for a guass slug that almost killed Victor early in the War (read: Patriots and Tyrants).
Well I’m sure you can see the “fun” that ensues. 
You should read this book, it’s definitely worth it.
Stupid Clanners… mucking things up worse than they already were.
