Ok, so, some background information on D&D that gives this book some extra context. There have been a few different editions of D&D. When the game updates to a new edition, there’s some big calamity in-universe to explain the game’s new rules and mechanical changes. Siege of Darkness came out around the time the game switched from Advanced D&D, the original, to D&D 2e. The calamity here was called The Time of Troubles. In a nutshell, a pair of gods get up to some shenanigans, tick off the head god, and the head god believes in collective punishment, so he banishes all the gods but one to the mortal world in mortal form.
Now, Siege of Darkness doesn’t really touch on this topic too deeply. Everything else you’ll need to know for this story gets explained in the book. But I find the added context helps. Aside from all that, Siege of Darkness picks up where Starless Night left off. Drizzt and co. know the drow are coming for them. So, the first part of the book deals with them contacting allies and shoring up defenses. Then the Time of Troubles kick in which, among other things, makes magic somewhat unreliable. Which itself drives a lot of the plot.
The Time of Troubles don’t last this whole book, they’re wrapped up by the time Part III starts. The rest of Siege of Darkness is the actual siege and it lives up to the name. Huge fight sequences, armies battling for survival, it’s all very epic. And it really wraps up this story arc. I know there’s another book in this arc, but really 90% of the plot is wrapped up by the end of this one. So, it’ll be kind of interesting to see how the cliffhanger we’re left with here resolves.