I’ve just finished reading Storm from the Shadows – for those unfamiliar with it, it’s David Weber‘s latest book in his Honorverse series – and while it was good, there’s one potential problem: it definitely references events that are taking place in Weber/Flint’s Torch of Freedom, as well as ones in Mission of Honor. Neither book is out yet; ToF is not until November. It’s not even on Baen Books’ schedule, yet.
That being said, you don’t need to read ToF to understand what’s going on SFtS, although if you want to get involved in this Nelson/Horatio Hornblower science fiction series you’re best off starting with On Basilisk Station and chewing your way through. But that’s the nature of long, well-developed genre fiction series.