A Shadow Thief breaking you out of your cell only gets you part way there. Someone else tried escaping through the sewers too, and maybe you can succeed where he did not.
You'll start off at 1 in the Escape Sewer if you were freed by the Shadow Thief sent by Imoen. There will be the odd Flaming Fist Mercenary patrolling about.
There will be Green Slimes at spots marked 2 and Carrion Crawlers at spots marked 3.
Bence Duncan, Corwin, and a few Flaming Fist Officers will be waiting for you at 5. Bence won't accept your surrender, saying you must die on account of Skie Silvershield. A Flaming Fist Battlemage and two more Flaming Fist Mercenaries, along with a magical barrier, will also cut off your escape at 6. Fighting all of them can be a suicidal proposition, as you're now solo. And there's no incentive as you've probably hit the xp cap by now. A tenable option is to make a break for the waterfall at 7 and go down it. Also, you can use either an Invisibility spell or a Potion of Invisibility (like the one the Shadow Thief gave you before you arrived here) to sneak away and down the waterfall.
Approaching the waterfall at 7 leads to falling near the chest at 8. The chest itself is opened with the Rusty Key. It has:
Sorcerer's
Place is a project run entirely by fans and for fans. Maintaining
Sorcerer's Place and a stable environment for all our hosted sites requires a substantial amount of our time and funds on a regular basis, so please consider supporting us to keep the site up & running smoothly. Thank you!
Supporting Sorcerer's Place
Has Sorcerer's Place been useful? If you'd like to show your appreciation
for our hard work on the site, and help us pay the bills the site generates
every month, please consider helping support SP.
Thank you!
"I haven't been this pleased with a group of folks since the Cormyrians sent the price of turnips through the roof during the Onion Famine." -Jan Jansen, Baldur's Gate II