This is a quite fascinating adventure, as it is far more of a sandbox than many although there's plenty going on to keep the characters busy - indeed they are likely to get swamped and prioritise what needs to be dealt with right now, and what can be done later if at all. You can run it with any Dungeons and Dragons ruleset from 3e to 5e, but it is designed with the aim of introducing - in character - the changes that transferring to D&D 5e would entail, being released prior to the launch of that ruleset.
You get a 32-page adventure guide, a 64-page setting book and a DM screen. The PDF version also includes additional material that was made available as free downloads to purchasers of the 'dead tree' version.
The Campaign Guide consists of a comprehensive gazetteer to the city of Baldur's Gate. Although the settlement has been mentioned in Forgotten Realms material for ages, here is the real low-down on the place, a good chance to really get to know it. With plentiful maps and illustrations and details on everything from municipal leaders to the best inns to frequent, its usefulness will last far beyond this adventure to anytime the party is in town. There are places to go, things to see and lots to do... and reading through it spawns plenty of ideas for adventure, particularly if your taste turns to urban plotliness (as mine does). Most of it is system-neutral so no matter which version of D&D you want to play, it will be a useful book to have to hand.
Turning attention to the adventure itself, Murder in Baldur's Gate, this teeming and prosperous city we have just read about is on the brink of breakdown. Part of this is due to inequality - the city is extremely stratified with the rich separated from the middle classes and them from those in real poverty - who are still expected to pay taxes although they don't get any of the services that the taxes are levied to fund! This is exacerbated by a spate of murders that herald attempts by the deity of assassins, Bhaal himself, to be resurrected with three villains competing to become his Chosen... and they do not care what happens to the city in the process. The delightful sting in the tail is that if the party chooses to solve the problem by removing those three rivals permanently, one of them will find Bhaal tapping on their shoulder instead!
Event piles upon event in dizzying complexity. The party won't see or be involved in everything, but it's likely that they will hear about the ones they don't witness - although how credible the reports are is open to question. The DM should study the material thoroughly in advance, after all it won't do for them to get swamped, that's the party's fate. Everything is laid out quite clearly, though, and there's a lot of flexibility to allow the DM to respond to the party's actions yet keep everything on track.
This adventure provides plenty of scope for interaction and intrigue, but violence is never far away so those looking for combat will not be disappointed. It's exciting and engrossing and gives low-level characters an unprecidented opportunity to be involved in momentous events. It all ends in buckets of blood, riots and possibly a big explosion: memorable in the extreme. For me it works well, I love urban intrigue and investigation - but it may be more of a struggle for those players who prefer a good dungeon crawl and conduct interactions at sword-point without the distraction of conversation!
[5 of 5 Stars!]