I'm impressed by Paizo's Pathfinder - they've really found a large audience (those intrepid gamers who just won't let D&D 3.5 die) and supply them well with innovative products and gaming modules that aim to please - and, by and large, succeed at this aim. Pathfinder 7: Curse of the Crimson Throne Part 1 provides a well-balanced adventure for low-level players.
Here is the very basic plot: In the city of Korvosa the PCs, called together my a mysterious woman, band together to put a cruel Dickensian criminal out of business. Shortly thereafter, however, Korvosa's king dies and all of the city is thrown into chaso. The PCs, enlisted by the city guard, begin to go on missions (everything from battles at a sinister butcher shop to dealing with a wily crimelord) for the good of their city, but there is treachery afoot...
The Good: This adventure will take PCs from 1st to 3rd level, and give them a good run for their money. There are ample mysteries to solve, a nice number of roleplaying encounters, good battles, and a well-thought-out dungeon crawl - overall, this adventure has a little bit of everything. Also, the production values of this book are fantastic, easily up to the usual Paizo Pathfinder standard: glossy pages, nice full-color art, easy-to-read stat blocks, and an intuitively laid-out adventure format. There is also a bonus besitary, an article on Varisian culture, and 4 pre-made PCs included, if your players want to get started right away. There is also an article on Harrowing, a vital part of this adventure, about which more later.
The Bad: Not much, actually. DMs should be aware that you will need the Pathfinder Roleplaying Game: The Pathfinder Bestiary (in addition, of course, to the Pathfinder Core Rulebook), although, in a pinch, a 3.5 Monster Manual and PHB/DMG will work. I would have preferred to have all of the creatures in this adventure statted out for me to reduce the number of books I'll need to have open running this, but oh well. One pet peeve - there are a number of typos in this book (misspelled words, nonsensical sentences, etc.) but nothing too major. Also, I found some of the encounters a little overly complicated (especially the on-ship battle in Old Korvosa), but a good DM can probably ease up on this.
Now to Harrowing: Harrow is the Pathfinder version of Tarot Cards and Harrow readings in Curse of the Crimson Throne occur throughout all parts of the adventure path. Harrow readings activate a Pathfinder rules mechanic similar to Action Points in Eberron, and so are fairly important. This adventure has an article about how to do Harrow readings if you don't have a Harrow Divination Deck (Pathfinder Chronicles) (you can do them with a deck of regular playing cards or even dice); you may want to get the actual Harrow Deck itself, as its kind of fun and kooky and will add nice flavor to the adventure. DMs with extra cash may also want to get the Curse of the Crimson Throne-flavored Gamemastery Item Cards: Curse of the Crimson Throne, which contains items drawn according to this adventure's iconography (but without any stats, etc. - they're essentially generic equipment cards).
I rate this adventure pretty highly, and I can't wait to run it for my group.