Since these are not explicit quests, there are no explicit rewards, other than advancing the plot, for completing the quests. This being the case, I will try discuss what can be done in each quest, and identify some of the items that are available for you to find. Therefore the Chapter 6 quest guide will be much more like a walk through, or an adventure log, or just my ramblings :)

Candlekeep is much as you remember it, yet there is something strange going on there. Everyone you encounter (Fuller, Parda, Hull, Dreppin, Winthrop, etc.) suggests that "things are strange here", "there are strange people here", "people have changed here", and "some members from the Iron Throne are meeting in the Library" - hint, hint!

In the Priest's Quarters (#2), if you ask the priest about his dead cats and what he is doing with them, he reveals himself to be a Doppleganger and attacks you. He is easily killed and you get: a "Laeral's Tear Necklace", worth $3000 (if you need gold at this point in the game).

There is not much going on in the Candlekeep Inn. There Winthrop warns you to stay clear of the Iron Throne nasties.

There just is not much going on in the Keep, not much to find and nothing interesting to purchase (except for a night's rest).

UPDATE: OK, I went back to a save game, picked up the "Normal Book", brought it through the catacombs and all the way back to Shaella at the Blade & Stars (BG, Area-B, #63), and .... it is not the book she wants! In fact, whether you have even been to Candlekeep or not, if you take the conversation path with Shaella (in either Chapt 5 or 7) that you have searched Candlekeep and cannot find the book, she tells you that "the lady has been kind to you for you have found it". You get NOTHING! A RED HERRING I guess!

If you talk to Koveras, he will offer to give you Gorion's ring (Ring of Protection +1), and if you take it, he tells you that the leaders of the Iron Throne are nearby and you should kill them. Whether you take the ring or not seems to make no other difference.

If you allow Koveras to "talk" (initiate a conversation) with you, you will be blamed for the murders of the Iron Throne leaders (Rieltar, Brunos, etc.) on the 3rd floor, even if you don't murder them or even talk to them! Then, as soon as you get to the 6th floor, you will be captured by a Gatewarden and put in Jail.

If you avoid conversation with Koveras, by skipping the 2nd floor and continuing up to the 3rd floor, then when you reach the 6th floor the Gatewarden will tell you that someone wants to talk to you in the outer grounds. The Gatewarden leaves and you can search the 6th floor. On your way back down, Koveras will intercept you on the 2nd floor and try to talk to you, and if he does, then the first Watcher you encounter (in the Library, or the one waiting in the grounds for you), will capture you and put you in Jail.

If you want to explore the entire Library, then skip exploring the 2nd floor (to avoid encountering Koveras), explore the rest of the way up to include the 6th floor, go back to the 2nd floor, talk to Koveras, explore the 2nd floor (hopefully avoiding any Watchers), then seek a Watcher (there should be one outside the library if you don't find one inside) so you can be captured.

You must eventually be captured and put in Jail to advance the plot.

If you have avoided talking to Koveras, then the Gatewarden will tell you that someone needs to talk to you in the Library grounds and he will leave. At this point you will be able to explore the 6th floor. Tethtoril tells you that Gorion left you some things in his old room on the 5th floor. Ulraunt is too busy to talk to you. On the 6th floor you will find a Ring of Protection +1, Wand of Magic Missiles, and scrolls of: Ghost Armor, Protection from Normal Missiles, and Protection from Petrification.

In Chapter 5, Shaella requested that you bring her back from the Library a "Book of Unknowing". I never did find this book in the Library. I did, however, find a "Normal Book" on the first floor, on a shelf just inside the Library entrance. But I didn't take this book with me, so don't know if it is the one Shaella wanted. Did anyone solve the Chapter 5 "Book of Unknowing" quest for Shaella?

Down the SW tunnel you will find traps and Spiders. The Phase Spiders were not much of a problem as I would let my trap-searching Thief lead the way and when a Spider appeared, he would lead it back to within range of my party's missiles. In this area you find scrolls of Protection from Acid, potions of: Invulnerability, Heroism, and Invisibility, a Cloak of Protection +2 (my Mage appreciated this!), a Manual of Gainful Exercise (+1 Strength), a Tome of Understanding (+1 Wisdom), and a ring of Fire Resistance.

Down the NW tunnel you will find Ghasts. The Ghasts were also not much of a problem as they too were revealed by my Thief and lead back near the main party for the ranged-attack slaughter. In this area you find a Warhammer +1, Fireball Wand, and potions of: Antidote, Stone Form, Fortitude, and Frost Giant Strength.

Down the NE tunnel you will find the entrance to Catacombs-2 and your next adventure.

Along the SW and NE walls of the hall there are some rooms. In these rooms you will find Jondalar, Hull, Karan, Fuller, Parda, and Reevor, but they are all Dopplegangers. Fighting them is not a problem as you encounter them one at a time if you enter each room (if you walk by the rooms, they will come out after you). In Jondalar's room (the first one on the left as you enter the level), there is a trapped chest which contains a scroll of Dispel Magic.

Along the top wall of the hall there is a tunnel to the NW. Here you will meet Elminster, Gorion, and Tethtoril. Elminster is a Greater Doppleganger, the other two are Dopplegangers. Elminster will try to trick you into believing that this is all an illusion caused by Sarevok, and will request that you follow him. If you agree to follow him, you will find yourself in the midst of a bunch of Dopplegangers and a tough fight. I took the conversation path of not believing their story, which caused the three to reveal themselves as Dopplegangers. This battle was a bit of a challenge, and you have to be careful not to back up too far into the hall and cause the skeletons to attack you from the rear, but hacking away with swords and having my magic users use ranged weapons dispatched the trio with only minor damage to the party.

As you continue past the bodies of Elminster, Gorion, and Tethtoril, the passage turns SW. Along this stretch there are more rooms, all containing Dopplegangers. At the end, the passage again turns NW and exits to Catacombs-3.

I chose to divided my party, sent my "stealthed" Thief SW, then east (to approach Prat from the west), sent my Mage and two others east then SW (to approach Prat from the NE), and my leader and Cleric directly south (to approach Prat from the north). The party attacking from the NE used fireballs, bows and slings. The party attacking from the north used bows and slings, and the Thief attacking from the west used his sling. It appeared that Prat and at least one other were magic users, so I ended up with one party member immobilized with Fear and my Thief and Cleric were beat up pretty badly (lost about 1/2 of their hit points). But after 3 fireballs and many arrows/bullets, Prat and his party were vanquished. Perhaps using Animate Dead and/or Monster Summoning would have helped, but I decided to try the battle without them. For killing Prat's party you get a Throwing Axe +2 (returns to user's hand), Darts of Stunning, Acid Arrows, and scrolls of: Chromatic Orb, Detect Evil, Luck, Resist Fear, Mirror Image, Strength, Ghoul Touch, Haste, Dire Charm, Ghost Armor, and Slow. Prat also carries a letter from Sarevok which reveals that you have been framed for the murders of Rieltar's party and that Sarevok plans to become the Grand Duke of Baldur's Gate and decide you fate.

As you work your way south through this level, you will encounter a few Web traps (my "stealthed" Thief triggered one) and some Phase and Sword Spiders. These were east and west of the area where you encountered Prat along the outer passages of the caverns.

Near the bottom of the cavern the passages converge in one area that is inhabited by two Greater Basilisks. Here I did use Summon Monsters and Animate Dead to absorb the Petrification attacks by the Basilisks. This battle was frustrating in that is was very hard to position my party so that more than a couple of them had shots at the Basilisks at one time. Luckily, the monsters (from a Wand of Summoning) were Hobgoblins with bows, so they could all plink away at the Basilisks when out of melee range while I tried to maneuver my party in to decent firing positions. I eventually prevailed without any of my party suffering petrification or other damage.

Beyond the Basilisks, in a SW passage, you will meet Diarmid who thinks that you are Prat and party. With prompting, Diarmid tells you that the Monks of Candlekeep believe that you murdered the Iron Throne leaders and plan to send you to BG for trial. By the time of the trial, Sarevok plans to be in control of the city. You (he still thinks you are Prat) are to meet Sarevok at the Iron Throne base in Baldur's Gate. When Diarmid finally realizes that you are not Prat, he departs.

Following the passage to the SW, you exit the Catacombs and find yourselves outside, on the south side of Candlekeep.

It seems it is now time to go back to Baldur's Gate to confront Sarevok.